1. Mineral Resources
2. Online Spatial Data
3. USMIN Mineral Deposit Database

Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative (ver. 7.0, November 2022)

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
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• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
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• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   U.S. Geological Survey, 20210316, Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative (ver. 7.0, November 2022): U.S. Geological Survey, Denver, CO.

   Online Links:

   • https://doi.org/10.5066/P9WHRLXH

   Other_Citation_Details:

   Suggested citation: U.S. Geological Survey, 2021, Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative: U.S. Geological Survey data release (ver. 7.0, October 2022), https://doi.org/10.5066/P9WHRLXH.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -150.4759
   East_Bounding_Coordinate: 11.19638
   North_Bounding_Coordinate: 65.9488
   South_Bounding_Coordinate: 31.87571
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 01-Oct-2019

   Ending_Date: present

   Currentness_Reference:

   Date extent of the Earth Mapping Resources Initiative (Earth MRI)

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: tabular digital data
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point
   2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is World Geodetic System 1984 (WGS84).
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.25722.
      
7. How does the data set describe geographic features?

   EMRI_Data.csv

   Table of spatial location data, geologic and descriptive attributes, and analytical results for Earth MRI project samples and associated QC samples. (Source: U.S. Geological Survey)

   Lab_ID

   Unique identifier assigned to each submitted sample by USGS Analytical Chemistry Sample Control (Source: U.S. Geological Survey) Alphanumeric text field for unique sample identification labels

   Field_ID

   The identifier originally assigned to a sample by collecting party or sample submitter. Field_ID values may not be unique in this database. (Source: U.S. Geological Survey) Alphanumeric text field for field identification labels

   Prev_Lab_ID

   The unique identifier previously assigned to a sample when analyzed earlier and the ID by which the sample is identified in the USGS National Sample Archive (Source: U.S. Geological Survey) Alphanumeric text field for unique sample identification labels

   IGSN

   Unique International Geo Sample Number (IGSN; https://www.igsn.org) assigned by the System for Earth Sample Registration (SESAR, https://www.geosamples.org) or another Allocating Agent (Source: U.S. Geological Survey) Alphanumeric text field for sample identification labels

   Parent_IGSN

   The IGSN identifier assigned to the parent sample, if any, from which material was sub-sampled (Source: U.S. Geological Survey) Alphanumeric text field for sample identification labels

   Ref_Flag

   A 'yes'/'no' field that identifies whether the sample is Geologic Reference Material (GRM). USGS GRMs are identified by name in the QAQC field. Submitter supplied Reference Materials may be also flagged here. All GRMs were submitted blind to the analytical laboratory. (Source: U.S. Geological Survey)

   Value	Definition
   Yes	The sample is identified as a Geologic Reference Material (GRM) sample used for Quality Control
   No	The sample is not identified as a Geologic Reference Material (GRM) sample

   QAQC_Sample

   Identification of samples used for quality assessment and quality control (QAQC). Contains either the name of the USGS Geologic Reference Material used or an indication of an analytical sample duplicate pair. 'Original' and 'Duplicate' = an actual sample and a second analysis of that same sample. (Source: U.S. Geological Survey)

   Value	Definition
   Original	The original sample that was randomly chosen to be split into an analytical duplicate pair.
   Duplicate	The duplicate or second split of a randomly chosen sample used as an analytical duplicate pair.

   Alphanumeric text field for QAQC sample names

   Job_ID

   Unique laboratory job identifier assigned by USGS Analytical Chemistry Sample Control. Jobs consist of a maximum of 50 samples. (Source: U.S. Geological Survey) Alphanumeric text field for unique job identification labels

   EMRI_JobNo

   Unique Earth MRI project shipment batch identifier assigned by USGS Analytical Chemistry Sample Control (Source: U.S. Geological Survey) Alphanumeric text field for Earth MRI job identification labels

   PID

   Unique identifier for each Earth MRI project as known to the program managers (Source: U.S. Geological Survey) Alphanumeric text field for Earth MRI job identification labels

   Proj_Name

   Earth MRI project name (Source: U.S. Geological Survey) Comment field

   Affiliation

   Name of affiliated or collaborating agency associated with the Proj_Name (Source: U.S. Geological Survey) Comment field

   Date_Submitted

   Date when sample was submitted for analysis; a date field with format DD-MMM-YY (Source: U.S. Geological Survey)

   Range of values
   Minimum:	24-Feb-20
   Maximum:	7-Mar-22
   Units:	dd-mmm-yy

   Date_Approved

   Date when sample analytical data were approved for release by a USGS Analytical Chemistry QC Reviewer; a date field with format DD-MMM-YY (Source: U.S. Geological Survey)

   Range of values
   Minimum:	14-Apr-20
   Maximum:	1-Aug-22
   Units:	dd-mmm-yy

   Lat_WGS84

   Latitude coordinate of sample site, reported in decimal degrees; converted, if necessary, to WGS84 datum (Source: U.S. Geological Survey)

   Range of values
   Minimum:	31.87571
   Maximum:	65.9488
   Units:	Decimal degrees

   Long_WGS84

   Longitude coordinate of sample site, reported in decimal degrees; converted, if necessary, to WGS84 datum (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-150.4759
   Maximum:	11.19638
   Units:	Decimal degrees

   Orig_Lat

   Latitude coordinate of sample site, in decimal degrees, as originally reported by the submitter; see Orig_Datum for the associated coordinate datum (Source: U.S. Geological Survey)

   Range of values
   Minimum:	31.87571
   Maximum:	65.9488
   Units:	Decimal degrees

   Orig_Long

   Longitude coordinate of sample site, in decimal degrees, as originally reported by the submitter; see Orig_Datum for the associated coordinate datum (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-150.4759
   Maximum:	11.19636
   Units:	Decimal degrees

   Orig_Datum

   The datum used to record the Orig_Lat and Orig_Long coordinates as originally reported by the submitter (Source: U.S. Geological Survey)

   Value	Definition
   NAD27	North American Datum of 1927 based on the Clarke Ellipsoid of 1866
   NAD83	North American Datum of 1983 based on the Geodetic Reference System of 1980
   WGS84	World Geodetic System of 1984

   Country

   Country in which the sample was collected (Source: U.S. Geological Survey) Alpha character field with full country name

   State

   Abbreviation of state from which the sample was collected; USPS 2-letter code (Source: U.S. Geological Survey)

   Formal codeset
   Codeset Name:	USPS 2-letter state code
   Codeset Source:	https://about.usps.com/who-we-are/postal-history/state-abbreviations.htm

   Location_Desc

   Geographic information relating to the location of the sample site (Source: U.S. Geological Survey) Uncontrolled comment field

   Sample_Type

   Primary sample media classification; rock, sediment, or soil (Source: U.S. Geological Survey)

   Value	Definition
   rock	A sample of 'rock' collected from the source identified in the Sample_Source field
   sediment	A sample of 'sediment' collected from the source identified in the Sample_Source field
   soil	A sample of 'soil' collected from the source identified in the Sample_Source field

   Sample_Desc

   Further description and comments regarding the sample (Source: U.S. Geological Survey) Uncontrolled comment field

   Date_Collected

   Date sample was collected as reported by the sample submitter, a text field with format MM/DD/YYYY or YYYY (Source: U.S. Geological Survey)

   Range of values
   Minimum:	6/20/1967
   Maximum:	7/26/2022
   Units:	mm/dd/yyyy or yyyy

   Method_Collected

   The manner in which the sample was collected (Source: U.S. Geological Survey)

   Value	Definition
   single/grab	Sample is collected without any attempt to composite material for representivity; may or may not be representative of material found at the site and is often used for collecting unusual, one-of-a-kind, or un-composited samples
   composite	Sample is collected with the intent to homogenize material and to be representative of a larger body (rock unit, local soil, etc.) at the site; consist of multiple subsamples or "grabs" and may be collected from multiple locations at the site
   channel	Sample is a composite sample collected over a continuous distance (e.g., chip samples of rock collected across the width of a bed, a sample collected by integrating media across the entire width of the stream)
   other	Sample was collected by a method other than 'single/grab', 'composite', or 'channel' and described in the Sample_Desc field
   unknown	The sample collected method was not recorded and is unknown

   Sample_Source

   Physical setting or environment from which the sample was collected (Source: U.S. Geological Survey)

   Value	Definition
   artificial exposure	sample collected from an artificial exposure such as a road cut, excavation, trench, or tunnel (but not from a mine)
   drill core	sample collected from drill core
   dune/loess	sample collected from eolian dune or loess deposit
   float/colluvium/talus	sample collected from float, colluvium, or talus implying that the sample may have moved from the original source
   mine dump/waste rock	sample collected from unprocessed mine material from a mine dump or waste rock pile
   mine/mill tailings	sample collected from mine material that has undergone some amount of processing or milling
   mine/quarry/prospect pit	sample collected from an open pit or underground mine, a quarry, or a prospect pit
   natural exposure/outcrop	sample collected from a natural exposure or outcrop
   stream/river	sample collected from a stream, river, brook, creek, wash, arroyo, or wadi
   unknown	the sample source was not recorded

   Sample_Depth

   Depth or range of depths at which the sample was collected; the unit for each measurement should be included with the depth value (Source: U.S. Geological Survey) Depth or range of depths at which the sample was collected

   Rock_Type

   The general rock classification; valid entries include 'igneous', 'sedimentary', 'metamorphic', 'tectonite', 'ore', 'miscellaneous', and 'unidentified' (Source: U.S. Geological Survey)

   Value	Definition
   igneous	rock formed through the cooling and solidification of magma or lava, may be plutonic or volcanic
   sedimentary	rock formed by the deposition of material at the Earth's surface
   metamorphic	rock formed by igneous or sedimentary rocks being subjected to heat and pressure
   tectonite	rock formed by shearing or tectonic forces
   ore	a rock category that includes many types of mineralized rock or veins; may include sub-economic ores
   miscellaneous	a rock that does not fit into normal rock classifications; examples include calcrete, concretion, gossan, limonite, jasperoid, sinter, melange, tektite, meteorite
   unidentified	the rock type was not identified when the sample was submitted

   Rock_Name

   The specific rock name. Textural and mineral rock name modifiers should be given in the Sample_Desc field. (Source: U.S. Geological Survey) Alpha character field containing a rock name

   Geologic_Age

   Geologic age or age range for a rock sample (Source: U.S. Geological Survey) Alpha character field containing a geologic age or age range

   Stratigraphy

   Formal or informal stratigraphic name of the Formation, Unit, or Member from which the sample was collected as reported by the sample submitter. No effort was made to ensure that entries conform to the North American Stratigraphic Code or other stratigraphic lexicons (https://ngmdb.usgs.gov/Geolex/stratres). (Source: U.S. Geological Survey) Alphanumeric character field with a stratigraphic name

   Igneous_Form

   The type of igneous body from which the sample was collected; used only for igneous rock samples (Source: U.S. Geological Survey)

   Value	Definition
   breccia/agglomerate	an igneous breccia or agglomerate
   dike/sill/laccolith	a dike, sill, or laccolith
   extrusive	an igneous extrusive body, not further defined
   intrusive	an igneous intrusive body, not further defined
   lava flow	a lava flow
   plug/pipe	an igneous plug or pipe
   pluton/stock	a pluton or stock
   pyroclastic	a pyroclastic flow

   Depositional_Env

   General depositional environment for a sedimentary rock; valid values include 'marine', 'continental', and 'transitional' (Source: U.S. Geological Survey)

   Value	Definition
   marine	originally deposited in a marine environment
   continental	originally deposited in a continental environment
   transitional	originally deposited in an environment transitional between marine and continental

   Metamorphism

   General type of metamorphism for a metamorphic rock; valid values include 'regional', 'contact', 'hydrothermal', and 'shear' (Source: U.S. Geological Survey)

   Value	Definition
   regional	regional metamorphism
   contact	contact metamorphism
   hydrothermal	hydrothermal metamorphism
   shear	metamorphism by shearing

   Facies_Grade

   Metamorphic facies or grade; used only for metamorphic rock samples (Source: U.S. Geological Survey) Alpha character field used to describe metamorphic facies

   Meta_SourceRk

   The original general rock type from which a metamorphic rock was derived; valid values include 'igneous' and 'sedimentary' (Source: U.S. Geological Survey)

   Value	Definition
   igneous	a meta-igneous rock
   sedimentary	a meta-sedimentary rock

   Mineralization

   Type of mineralization identified in a rock (Source: U.S. Geological Survey) Alpha character field used to describe mineralization type

   Alteration

   Type of alteration identified in a rock (Source: U.S. Geological Survey) Alpha character field used to describe alteration type

   Land_Cover

   Sample environment or 'Land Cover' from which a soil sample was collected (Source: U.S. Geological Survey) Alpha character field used to describe sample environment

   Soil_Parent

   Parent material from which a sampled soil developed (Source: U.S. Geological Survey) Alpha character field used to describe soil parent material

   Soil_Horizon

   Soil horizon that was sampled (Source: U.S. Geological Survey) Alpha character field used to describe the soil horizon that was sampled

   Horizon_Char

   A characterization of how well the sampled soil horizon was defined; valid values include 'well defined', 'poorly defined', or 'not defined' (Source: U.S. Geological Survey) A characterization of how well the sampled soil horizon was defined

   Organic_Conc

   A general observation on the amount of organic material found in the sampled soil (Source: U.S. Geological Survey) A general observation on the amount of organic material found in the sampled soil

   Soil_Moisture

   A general observation on the amount of moisture observed at the soil sample site (Source: U.S. Geological Survey) A general observation on the amount of moisture observed at the soil sample site

   Soil_Drainage

   An indication of how well drained the soil sample site is; valid values include 'well drained' or 'poorly drained' (Source: U.S. Geological Survey)

   Value	Definition
   well drained	The soil sample site is well drained
   poorly drained	The soil sample site is poorly drained

   Soil_Salinity

   Soil salinity: valid values include 'saline' and 'non-saline' (Source: U.S. Geological Survey)

   Value	Definition
   saline	The soil at the sample site is saline; contains or is impregnated with salt
   non-saline	The soil at the sample site is not saline

   Ferritic_Char

   The ferritic character of the sample soil: valid values include 'ferritic' and 'non-ferritic' (Source: U.S. Geological Survey)

   Value	Definition
   ferritic	The soil at the sample site is ferritic; contains visible iron oxides
   non-ferritic	The soil at the sample site is not ferritic

   Sample_Prep

   A description of the sample preparation method used (Source: U.S. Geological Survey) Alpha character field used to describe the sample preparation methods

   Analytic_Mthds

   Laboratory codes for the analytical methods used to analyze the sample. Multiple laboratory codes separated by semicolons. (Source: U.S. Geological Survey)

   Value	Definition
   C_AQUA_REGIA	The sample is digested with aqua regia and then analyzed by ICP-OES and ICP-MS for 51 elements (Al, Ca, Fe, K, Mg, Na, S, Ti, Ag, As, Au, B, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Ga, Ge, Hf, Hg, In, La, Li, Mn, Mo, Nb, Ni, P, Pb, Rb, Re, Sb, Sc, Se, Sn, Sr, Ta, Te, Th, Tl, U, V, W, Y, Zn, Zr). A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_FA_AU-PD-PT	Gold, Palladium, and Platinum are determined by lead fusion and ICP-OES and ICP-MS after collection by fire assay. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_FA_ICPMS-AU	Gold is determined by lead fusion and ICP-OES and ICP-MS after collection by fire assay. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_ICPOES_MS-60	Total concentrations for 60- or 61-elements (Al, Ca, Fe, K, Mg, P, S, Si, Ti, Ag, As, B, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho, In, La, Li, Lu, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Re, Sb, Sc, Se, Sm, Sn, Sr, Ta, Tb, Te, Th, Tl, Tm, U, V, W, Y, Yb, Zn, Zr) are analyzed by ICP-OES and ICP-MS after a sodium peroxide fusion. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_ISE-F	Fluoride is determined by ion-selective electrode (ISE) following a sodium hydroxide fusion. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_TOTAL-S	Total Sulfur is determined in geologic materials by combustion followed by infrared detection on LECO instrumentation. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_WDXRF-MAJORS	Major elements are determined by WDXRF and reported as major element oxides (SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, P2O5, BaO, Cr2O3, SrO, V2O5). The method also provides a gravimetric loss on ignition (LOI). A full method description is included within these metadata in the Sample Analysis and Methods process step section.

   Alphanumeric text field for samples analyzed by multiple analytical methods. Laboratory codes separated by a semicolon

   Al_pct_ICP60

   Aluminum, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-25% Al. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	20.7
   Units:	weight percent (% or pct)

   Ca_pct_ICP60

   Calcium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-35% Ca. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	52.7
   Units:	weight percent (% or pct)

   Fe_pct_ICP60

   Iron, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-30% Fe. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	68.0
   Units:	weight percent (% or pct)

   K_pct_ICP60

   Potassium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-25% K. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	12.6
   Units:	weight percent (% or pct)

   Mg_pct_ICP60

   Magnesium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-30% Mg. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	19.4
   Units:	weight percent (% or pct)

   P_pct_ICP60

   Phosphorous, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-25% P. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	17.7
   Units:	weight percent (% or pct)

   S_pct_ICP60

   Sulfur, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-40% S. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	37.4
   Units:	weight percent (% or pct)

   Si_pct_ICP60

   Silicon, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-40% Si. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. However, a few samples were reported only as >40.0 and these can be identified with the replaced value of 40.01111. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.01
   Maximum:	54.9
   Units:	weight percent (% or pct)

   Ti_pct_ICP60

   Titanium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-25% Ti. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	17.3
   Units:	weight percent (% or pct)

   Ag_ppm_ICP60

   Silver, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 1-1,000 ppm Ag. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	6260
   Units:	parts per million by weight (ppm)

   As_ppm_ICP60

   Arsenic, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-100,000 ppm As. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	228000
   Units:	parts per million by weight (ppm)

   B_ppm_ICP60

   Boron, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 10-10,000 ppm B. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-10
   Maximum:	22300
   Units:	parts per million by weight (ppm)

   Ba_ppm_ICP60

   Barium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-10,000 ppm Ba. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. However, a few samples were reported only as >10000 and these can be identified with the replaced value of 10000.1111. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	226400
   Units:	parts per million by weight (ppm)

   Be_ppm_ICP60

   Beryllium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-2,500 ppm Be. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	12100
   Units:	parts per million by weight (ppm)

   Bi_ppm_ICP60

   Bismuth, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-1,000 ppm Bi. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	5730
   Units:	parts per million by weight (ppm)

   Cd_ppm_ICP60

   Cadmium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.2-10,000 ppm Cd. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.2
   Maximum:	11200
   Units:	parts per million by weight (ppm)

   Ce_ppm_ICP60

   Cerium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm Ce. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.3
   Maximum:	36100
   Units:	parts per million by weight (ppm)

   Co_ppm_ICP60

   Cobalt, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-10,000 ppm Co. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	30300
   Units:	parts per million by weight (ppm)

   Cr_ppm_ICP60

   Chromium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 10-100,000 ppm Cr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-10
   Maximum:	5630
   Units:	parts per million by weight (ppm)

   Cs_ppm_ICP60

   Cesium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm Cs. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	312
   Units:	parts per million by weight (ppm)

   Cu_ppm_ICP60

   Copper, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-50,000 ppm Cu. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	294000
   Units:	parts per million by weight (ppm)

   Dy_ppm_ICP60

   Dysprosium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Dy. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	2010
   Units:	parts per million by weight (ppm)

   Er_ppm_ICP60

   Erbium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Er. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	1240
   Units:	parts per million by weight (ppm)

   Eu_ppm_ICP60

   Europium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Eu. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	249
   Units:	parts per million by weight (ppm)

   Ga_ppm_ICP60

   Gallium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.01-1,000 ppm Ga. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	201
   Units:	parts per million by weight (ppm)

   Gd_ppm_ICP60

   Gadolinium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Gd. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	1250
   Units:	parts per million by weight (ppm)

   Ge_ppm_ICP60

   Germanium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 1-1,000 ppm Ge. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	1050
   Units:	parts per million by weight (ppm)

   Hf_ppm_ICP60

   Hafnium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 1-10,000 ppm Hf. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	1950
   Units:	parts per million by weight (ppm)

   Ho_ppm_ICP60

   Holmium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Ho. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	389
   Units:	parts per million by weight (ppm)

   In_ppm_ICP60

   Indium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.2-1,000 ppm In. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.2
   Maximum:	57.8
   Units:	parts per million by weight (ppm)

   La_ppm_ICP60

   Lanthanum, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm La. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.1
   Maximum:	35600
   Units:	parts per million by weight (ppm)

   Li_ppm_ICP60

   Lithium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 10-50,000 ppm Li. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-10
   Maximum:	2450
   Units:	parts per million by weight (ppm)

   Lu_ppm_ICP60

   Lutetium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Lu. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	138
   Units:	parts per million by weight (ppm)

   Mn_ppm_ICP60

   Manganese, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 10-100,000 ppm Mn. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-10
   Maximum:	425000
   Units:	parts per million by weight (ppm)

   Mo_ppm_ICP60

   Molybdenum, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 2-10,000 ppm Mo. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-2
   Maximum:	7340
   Units:	parts per million by weight (ppm)

   Nb_ppm_ICP60

   Niobium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm Nb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	26400
   Units:	parts per million by weight (ppm)

   Nd_ppm_ICP60

   Neodymium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm Nd. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	7820
   Units:	parts per million by weight (ppm)

   Ni_ppm_ICP60

   Nickel, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-10,000 ppm Ni. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	12600
   Units:	parts per million by weight (ppm)

   Pb_ppm_ICP60

   Lead, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-50,000 ppm Pb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	662000
   Units:	parts per million by weight (ppm)

   Pr_ppm_ICP60

   Praseodymium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Pr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	2890
   Units:	parts per million by weight (ppm)

   Rb_ppm_ICP60

   Rubidium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.2-10,000 ppm Rb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.2
   Maximum:	1130
   Units:	parts per million by weight (ppm)

   Re_ppm_ICP60

   Rhenium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.02-500 ppm Re. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.02
   Maximum:	9.96
   Units:	parts per million by weight (ppm)

   Sb_ppm_ICP60

   Antimony, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm Sb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	7640
   Units:	parts per million by weight (ppm)

   Sc_ppm_ICP60

   Scandium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-50,000 ppm Sc. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	615
   Units:	parts per million by weight (ppm)

   Se_ppm_ICP60

   Selenium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-1,000 ppm Se. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	319
   Units:	parts per million by weight (ppm)

   Sm_ppm_ICP60

   Samarium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-1,000 ppm Sm. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	856
   Units:	parts per million by weight (ppm)

   Sn_ppm_ICP60

   Tin, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 1-10,000 ppm Sn. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	264
   Units:	parts per million by weight (ppm)

   Sr_ppm_ICP60

   Strontium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-10,000 ppm Sr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	49100
   Units:	parts per million by weight (ppm)

   Ta_ppm_ICP60

   Tantalum, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-10,000 ppm Ta. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	229
   Units:	parts per million by weight (ppm)

   Tb_ppm_ICP60

   Terbium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Tb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	324
   Units:	parts per million by weight (ppm)

   Te_ppm_ICP60

   Tellurium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-1,000 ppm Te. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	79.3
   Units:	parts per million by weight (ppm)

   Th_ppm_ICP60

   Thorium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-1,000 ppm Th. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	19700
   Units:	parts per million by weight (ppm)

   Tl_ppm_ICP60

   Thallium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-1,000 ppm Tl. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	135
   Units:	parts per million by weight (ppm)

   Tm_ppm_ICP60

   Thulium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm Tm. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	179
   Units:	parts per million by weight (ppm)

   U_ppm_ICP60

   Uranium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.05-1,000 ppm U. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	564
   Units:	parts per million by weight (ppm)

   V_ppm_ICP60

   Vanadium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-10,000 ppm V. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	4590
   Units:	parts per million by weight (ppm)

   W_ppm_ICP60

   Tungsten, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 1-10,000 ppm W. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	40800
   Units:	parts per million by weight (ppm)

   Y_ppm_ICP60

   Yttrium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-10,000 ppm Y. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	13400
   Units:	parts per million by weight (ppm)

   Yb_ppm_ICP60

   Ytterbium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.1-1,000 ppm Yb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	1150
   Units:	parts per million by weight (ppm)

   Zn_ppm_ICP60

   Zinc, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 5-50,000 ppm Zn. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	564000
   Units:	parts per million by weight (ppm)

   Zr_ppm_ICP60

   Zirconium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Method detection range: 0.5-10,000 ppm Zr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	87700
   Units:	parts per million by weight (ppm)

   SiO2_pct_WDX

   Silicon, reported as silicon dioxide or silica (SiO2) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-90% SiO2. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	98.94
   Units:	weight percent (% or pct)

   TiO2_pct_WDX

   Titanium, reported as titanium dioxide or titania (TiO2) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-25% TiO2. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	36.52
   Units:	weight percent (% or pct)

   Al2O3_pct_WDX

   Aluminum, reported as aluminum oxide or alumina (Al2O3) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-75% Al2O3. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	41.09
   Units:	weight percent (% or pct)

   Fe2O3_pct_WDX

   Total iron (regardless of the oxidation state), reported as iron(III) oxide or ferric oxide (Fe2O3) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-75% Fe2O3. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.03
   Maximum:	91.5
   Units:	weight percent (% or pct)

   MnO_pct_WDX

   Manganese, reported as manganese(II) oxide (MnO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-10% MnO. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	51.1
   Units:	weight percent (% or pct)

   MgO_pct_WDX

   Magnesium, reported as magnesium oxide or magnesia (MgO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-10% MgO. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	31.8
   Units:	weight percent (% or pct)

   CaO_pct_WDX

   Calcium, reported as calcium oxide or quicklime (CaO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-60% CaO. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	71.55
   Units:	weight percent (% or pct)

   Na2O_pct_WDX

   Sodium, reported as sodium oxide (Na2O) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-30% Na2O. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	11.6
   Units:	weight percent (% or pct)

   K2O_pct_WDX

   Potassium, reported as potassium oxide (K2O) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-30% K2O. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	16.90
   Units:	weight percent (% or pct)

   P2O5_pct_WDX

   Phosphorus, reported as phosphorus pentoxide (P2O5) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-25% P2O5. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	37.10
   Units:	weight percent (% or pct)

   BaO_pct_WDX

   Barium, reported as barium oxide or baria (BaO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-10% BaO. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	48.0
   Units:	weight percent (% or pct)

   Cr2O3_pct_WDX

   Chromium, reported as chromium(III) oxide or chromia (Cr2O3) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-10% Cr2O3. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	0.72
   Units:	weight percent (% or pct)

   SrO_pct_WDX

   Strontium, reported as strontium oxide or strontia (SrO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-10% SrO. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	6.19
   Units:	weight percent (% or pct)

   V2O5_pct_WDX

   Vanadium, reported as vanadium pentoxide or vanadia (V2O5) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Method detection range: 0.01-10% V2O5. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	0.91
   Units:	weight percent (% or pct)

   LOI_pct_WDX

   Loss on ignition (LOI), in weight percent, determined by gravimetry (C_WDXRF-MAJORS). Method detection range: 0.01-50% LOI. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.48
   Maximum:	95.8
   Units:	weight percent (% or pct)

   F_pct_ISE

   Fluoride anion (F-), in weight percent, determined by ion-selective electrode following a sodium hydroxide fusion (C_ISE-F). Method detection range: 0.01-10% F. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.01
   Maximum:	36.4
   Units:	weight percent (% or pct)

   S_pct_IR

   Total sulfur, in weight percent, determined by combustion followed by LECO infrared detection (S_pct_IR). Method detection range: 0.005-100% S. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.005
   Maximum:	8.40
   Units:	weight percent (% or pct)

   Au_ppb_FA

   Gold, in parts per billion by weight, determined by ICP-OES-MS after a lead fusion fire assay (C_FA_ICPMS-AU or C_FA_AU-PD-PT). Method detection range: 1-10,000 ppb Au. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	59467
   Units:	parts per billion by weight (ppb)

   Pd_ppb_FA

   Palladium, in parts per billion by weight, determined by ICP-OES-MS after a lead fusion fire assay (C_FA_AU-PD-PT). Method detection range: 1-10,000 ppb Pd. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	530
   Units:	parts per billion by weight (ppb)

   Pt_ppb_FA

   Platinum, in parts per billion by weight, determined by ICP-OES-MS after a lead fusion fire assay (C_FA_AU-PD-PT). Method detection range: 5-10,000 ppb Pt. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	170
   Units:	parts per billion by weight (ppb)

   Al_pct_AR

   Aluminum, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-25% Al. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	3.72
   Units:	weight percent (% or pct)

   Ca_pct_AR

   Calcium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-25% Ca. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	19.9
   Units:	weight percent (% or pct)

   Fe_pct_AR

   Iron, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-30% Fe. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	14.5
   Units:	weight percent (% or pct)

   K_pct_AR

   Potassium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-25% K. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	0.87
   Units:	weight percent (% or pct)

   Mg_pct_AR

   Magnesium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-25% Mg. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	10.8
   Units:	weight percent (% or pct)

   Na_pct_AR

   Sodium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-25% Na. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	0.35
   Units:	weight percent (% or pct)

   S_pct_AR

   Sulfur, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-30% S. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	8.89
   Units:	weight percent (% or pct)

   Ti_pct_AR

   Titanium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-25% Na. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	0.69
   Units:	weight percent (% or pct)

   Ag_ppm_AR

   Silver, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-100 ppm Ag (changed to 0.05-100 ppm Ag June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	102
   Units:	parts per million by weight (ppm)

   As_ppm_AR

   Arsenic, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-10,000 ppm As. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.8
   Maximum:	88300
   Units:	parts per million by weight (ppm)

   Au_ppm_AR

   Gold, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.005-10 ppm Au (changed to 0.05-10 ppm Au June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	51.5
   Units:	parts per million by weight (ppm)

   B_ppm_AR

   Boron, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 5-1,000 ppm B. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-5
   Maximum:	121
   Units:	parts per million by weight (ppm)

   Ba_ppm_AR

   Barium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 1-10,000 ppm Ba. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	2810
   Units:	parts per million by weight (ppm)

   Be_ppm_AR

   Beryllium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Be. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	23.5
   Units:	parts per million by weight (ppm)

   Bi_ppm_AR

   Bismuth, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-1,000 ppm Bi. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	39.2
   Units:	parts per million by weight (ppm)

   Cd_ppm_AR

   Cadmium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-1,000 ppm Cd. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	30.4
   Units:	parts per million by weight (ppm)

   Ce_ppm_AR

   Cerium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-1,000 ppm Ce. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4.88
   Maximum:	319
   Units:	parts per million by weight (ppm)

   Co_ppm_AR

   Cobalt, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-10,000 ppm Co. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.5
   Maximum:	143
   Units:	parts per million by weight (ppm)

   Cr_ppm_AR

   Chromium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.5-10,000 ppm Cr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	508
   Units:	parts per million by weight (ppm)

   Cs_ppm_AR

   Cesium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Cs. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.09
   Maximum:	175
   Units:	parts per million by weight (ppm)

   Cu_ppm_AR

   Copper, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.5-10,000 ppm Cu. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	1250
   Units:	parts per million by weight (ppm)

   Ga_ppm_AR

   Gallium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Ga. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.35
   Maximum:	24.9
   Units:	parts per million by weight (ppm)

   Ge_ppm_AR

   Germanium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Ge. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	1.28
   Units:	parts per million by weight (ppm)

   Hf_ppm_AR

   Hafnium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.02-1,000 ppm Hf. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.02
   Maximum:	3.72
   Units:	parts per million by weight (ppm)

   Hg_ppm_AR

   Mercury, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-100 ppm Hg. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	26.6
   Units:	parts per million by weight (ppm)

   In_ppm_AR

   Indium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.005-1,000 ppm In (changed to 0.05-1,000 ppm In June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	12.7
   Units:	parts per million by weight (ppm)

   La_ppm_AR

   Lanthanum, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-1,000 ppm La. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	149
   Units:	parts per million by weight (ppm)

   Li_ppm_AR

   Lithium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-10,000 ppm Li. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	244
   Units:	parts per million by weight (ppm)

   Mn_ppm_AR

   Manganese, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 1-10,000 ppm Mn. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-1
   Maximum:	15300
   Units:	parts per million by weight (ppm)

   Mo_ppm_AR

   Molybdenum, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-10,000 ppm Mo. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	77
   Units:	parts per million by weight (ppm)

   Nb_ppm_AR

   Niobium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Nb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	14
   Units:	parts per million by weight (ppm)

   Ni_ppm_AR

   Nickel, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.5-10,000 ppm Ni. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	1160
   Units:	parts per million by weight (ppm)

   P_ppm_AR

   Phosphorus, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 10-250,000 ppm P (changed to 1-250,000 ppm P June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-10
   Maximum:	4100
   Units:	parts per million by weight (ppm)

   Pb_ppm_AR

   Lead, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-10,000 ppm Pb (changed to 0.1-200 ppm Pb June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. However, one sample was reported only as >200 and it can be identified with the replaced value of 200.1111. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.2
   Maximum:	4240
   Units:	parts per million by weight (ppm)

   Rb_ppm_AR

   Rubidium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-1,000 ppm Rb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.3
   Maximum:	251
   Units:	parts per million by weight (ppm)

   Re_ppm_AR

   Rhenium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.001-1,000 ppm Re (changed to 0.005-1,000 ppm Re June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.005
   Maximum:	0.042
   Units:	parts per million by weight (ppm)

   Sb_ppm_AR

   Antimony, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Sb. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	2030
   Units:	parts per million by weight (ppm)

   Sc_ppm_AR

   Scandium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-1,000 ppm Sc. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.1
   Maximum:	9.8
   Units:	parts per million by weight (ppm)

   Se_ppm_AR

   Selenium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.2-1,000 ppm Se (changed to 0.05-1,000 ppm Se June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.2
   Maximum:	26.6
   Units:	parts per million by weight (ppm)

   Sn_ppm_AR

   Tin, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.2-1,000 ppm Sn (changed to 0.3-1,000 ppm Sn June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.3
   Maximum:	9.2
   Units:	parts per million by weight (ppm)

   Sr_ppm_AR

   Strontium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.2-1,000 ppm Sr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.2
   Maximum:	1630
   Units:	parts per million by weight (ppm)

   Ta_ppm_AR

   Tantalum, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-1,000 ppm Ta (changed to 0.005-1,000 ppm Ta June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	0.46
   Units:	parts per million by weight (ppm)

   Te_ppm_AR

   Tellurium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-1,000 ppm Te (changed to 0.05-1,000 ppm Te June 2022). Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	11.9
   Units:	parts per million by weight (ppm)

   Th_ppm_AR

   Thorium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.1-1,000 ppm Th. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.3
   Maximum:	153
   Units:	parts per million by weight (ppm)

   Tl_ppm_AR

   Thallium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.01-1,000 ppm Tl. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.01
   Maximum:	11.6
   Units:	parts per million by weight (ppm)

   U_ppm_AR

   Uranium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm U. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.07
   Maximum:	168
   Units:	parts per million by weight (ppm)

   V_ppm_AR

   Vanadium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.5-1,000 ppm V. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	681
   Units:	parts per million by weight (ppm)

   W_ppm_AR

   Tungsten, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm W. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.05
   Maximum:	1010
   Units:	parts per million by weight (ppm)

   Y_ppm_AR

   Yttrium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.05-1,000 ppm Y. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.91
   Maximum:	122
   Units:	parts per million by weight (ppm)

   Zn_ppm_AR

   Zinc, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.5-10,000 ppm Zn. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	4170
   Units:	parts per million by weight (ppm)

   Zr_ppm_AR

   Zirconium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Method detection range: 0.5-1,000 ppm Zr. Concentrations less than the Lower Detection Limit (<LDL) are identified with a negative sign (-LDL). Sample solutions with concentrations exceeding the Upper Detection Limit were diluted and reanalyzed to provide an actual concentration value. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.5
   Maximum:	42.5
   Units:	parts per million by weight (ppm)

   EMRI_Locations.shp

   Shapefile with sample identification and spatial location information from EMRI_Data.csv (Source: U.S. Geological Survey)

   FID

   Unique internal feature number managed by Esri. (Source: Esri)

   Range of values
   Minimum:	0
   Maximum:	4675
   Units:	sequential integers

   SHAPE

   Internal feature geometry managed by Esri. (Source: Esri) geometry:Point

   Lab_ID

   Unique identifier assigned to each submitted sample by USGS Analytical Chemistry Sample Control (Source: U.S. Geological Survey) Alphanumeric text field for unique sample identification labels

   Field_ID

   The identifier originally assigned to a sample by collecting party or sample submitter. Field_ID values may not be unique in this database. (Source: U.S. Geological Survey) Alphanumeric text field for field identification labels

   Job_ID

   Unique laboratory job identifier assigned by USGS Analytical Chemistry Sample Control. Jobs consist of a maximum of 50 samples. (Source: U.S. Geological Survey) Alphanumeric text field for unique job identification labels

   EMRI_JobNo

   Unique Earth MRI project shipment batch identifier assigned by USGS Analytical Chemistry Sample Control (Source: U.S. Geological Survey) Alphanumeric text field for Earth MRI job identification labels

   PID

   Unique identifier for each Earth MRI project as known to the program managers (Source: U.S. Geological Survey) Alphanumeric text field for Earth MRI job identification labels

   Proj_Name

   Earth MRI project name (Source: U.S. Geological Survey) Comment field

   Lat_WGS84

   Latitude coordinate of sample site, reported in decimal degrees; converted, if necessary, to WGS84 datum (Source: U.S. Geological Survey)

   Range of values
   Minimum:	31.87571
   Maximum:	65.9488
   Units:	Decimal degrees

   Long_WGS84

   Longitude coordinate of sample site, reported in decimal degrees; converted, if necessary, to WGS84 datum (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-150.4759
   Maximum:	11.19638
   Units:	Decimal degrees

   State

   Abbreviation of state from which the sample was collected; USPS 2-letter code (Source: U.S. Geological Survey)

   Formal codeset
   Codeset Name:	USPS 2-letter state code
   Codeset Source:	https://about.usps.com/who-we-are/postal-history/state-abbreviations.htm

   Limits_AnalyticalMethods.csv

   A table of lower and upper detection limits for every element or constituent by each of the analytical methods used in by EarthMRI projects (Source: U.S. Geological Survey)

   SortOrder

   An integer value used to sort records (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	451

   Analytic_Mthds

   Laboratory codes for the analytical methods. (Source: U.S. Geological Survey)

   Value	Definition
   C_AQUA_REGIA	The sample is digested with aqua regia and then analyzed by ICP-OES and ICP-MS for 51 elements (Al, Ca, Fe, K, Mg, Na, S, Ti, Ag, As, Au, B, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Ga, Ge, Hf, Hg, In, La, Li, Mn, Mo, Nb, Ni, P, Pb, Rb, Re, Sb, Sc, Se, Sn, Sr, Ta, Te, Th, Tl, U, V, W, Y, Zn, Zr). A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_FA_AU-PD-PT	Gold, Palladium, and Platinum are determined by lead fusion and ICP-OES and ICP-MS after collection by fire assay. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_FA_ICPMS-AU	Gold is determined by lead fusion and ICP-OES and ICP-MS after collection by fire assay. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_ICPOES_MS-60	Total concentrations for 60- or 61-elements (Al, Ca, Fe, K, Mg, P, S, Si, Ti, Ag, As, B, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho, In, La, Li, Lu, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Re, Sb, Sc, Se, Sm, Sn, Sr, Ta, Tb, Te, Th, Tl, Tm, U, V, W, Y, Yb, Zn, Zr) are analyzed by ICP-OES and ICP-MS after a sodium peroxide fusion. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_ISE-F	Fluoride is determined by ion-selective electrode (ISE) following a sodium hydroxide fusion. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_TOTAL-S	Total Sulfur is determined in geologic materials by combustion followed by infrared detection on LECO instrumentation. A full method description is included within these metadata in the Sample Analysis and Methods process step section.
   C_WDXRF-MAJORS	Major elements are determined by WDXRF and reported as major element oxides (SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, P2O5, BaO, Cr2O3, SrO, V2O5). The method also provides a gravimetric loss on ignition (LOI). A full method description is included within these metadata in the Sample Analysis and Methods process step section.

   Constituent

   Element or constituent analyzed and reported. (Source: U.S. Geological Survey) Alpha character field containing an element symbol from the Periodic Table of Elements or other analyzed constituent

   LowerDetectLimit

   Lower Detection Limit for the listed constituent by the given analytical method. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.0001
   Maximum:	10
   Units:	Unit defined in associated Unit field

   UpperDetectLimit

   Upper Detection Limit for the listed constituent by the given analytical method. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	10
   Maximum:	250000
   Units:	Unit defined in associated Unit field

   LowerDL2

   New Lower Detection Limit for the listed constituent by the given analytical method (as of June 2022). (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.005
   Maximum:	1
   Units:	Unit defined in associated Unit field

   UpperDL2

   New Upper Detection Limit for the listed constituent by the given analytical method (as of June 2022). (Source: U.S. Geological Survey)

   Range of values
   Minimum:	200
   Maximum:	200
   Units:	Unit defined in associated Unit field

   Unit

   Unit of measurement for the values listed in the Lower and Upper Detection Limit fields. (Source: U.S. Geological Survey) Alpha character field describing units of measurement

   Instrument

   The analytical instrument used by the laboratory to determine constituent concentrations. (Source: U.S. Geological Survey)

   Value	Definition
   ICP-MS	Inductively Coupled Plasma-Mass Spectrometer
   ICP-OES	Inductively Coupled Plasma-Optical Emission Spectrometer
   ISE	Ion-Selective Electrode
   LECO IR	LECO Infrared Detector
   WDXRF	Wavelength Dispersive X-Ray Fluorescence Spectrometer

   QAQC_Values.csv

   A table supplying the preferred and mean values expected for USGS Geologic Reference Materials used when analyzing geochemical samples for Earth MRI projects. Many attributes describing the concentrations for various elements contain a mix of numeric and character values. (Source: U.S. Geological Survey)

   SortOrder

   An integer value used to sort records (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	152

   GRM

   USGS Geologic Reference Material (GRM) name (Source: U.S. Geological Survey) Alphanumeric text field for GRM sample names

   ValueType

   Type of reference value for the GRM (Source: U.S. Geological Survey)

   Value	Definition
   Preferred	concentration values determined by analyzing the GRM by multiple laboratories and instruments
   Mean	values determined by the most recent calculation of the average concentration of multiple analyses by the current method and laboratory

   Al_pct_ICP60

   Aluminum, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.18
   Maximum:	11.1
   Units:	weight percent (% or pct)

   Ca_pct_ICP60

   Calcium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.15
   Maximum:	33.4
   Units:	weight percent (% or pct)

   Fe_pct_ICP60

   Iron, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.19
   Maximum:	9.65
   Units:	weight percent (% or pct)

   K_pct_ICP60

   Potassium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.02
   Maximum:	4.59
   Units:	weight percent (% or pct)

   Mg_pct_ICP60

   Magnesium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.03
   Maximum:	13.0
   Units:	weight percent (% or pct)

   P_pct_ICP60

   Phosphorous, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	0.44
   Units:	weight percent (% or pct)

   S_pct_ICP60

   Sulfur, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	5.35
   Units:	weight percent (% or pct)

   Si_pct_ICP60

   Silicon, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.53
   Maximum:	34.81
   Units:	weight percent (% or pct)

   Ti_pct_ICP60

   Titanium, in weight percent, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.01
   Maximum:	1.62
   Units:	weight percent (% or pct)

   Ag_ppm_ICP60

   Silver, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.06
   Maximum:	92
   Units:	parts per million by weight (ppm)

   As_ppm_ICP60

   Arsenic, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.22
   Maximum:	626
   Units:	parts per million by weight (ppm)

   B_ppm_ICP60

   Boron, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<10
   Maximum:	269
   Units:	parts per million by weight (ppm)

   Ba_ppm_ICP60

   Barium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	5.9
   Maximum:	31800
   Units:	parts per million by weight (ppm)

   Be_ppm_ICP60

   Beryllium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	22
   Units:	parts per million by weight (ppm)

   Bi_ppm_ICP60

   Bismuth, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.02
   Maximum:	23
   Units:	parts per million by weight (ppm)

   Cd_ppm_ICP60

   Cadmium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.07
   Maximum:	41.7
   Units:	parts per million by weight (ppm)

   Ce_ppm_ICP60

   Cerium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.74
   Maximum:	7760
   Units:	parts per million by weight (ppm)

   Co_ppm_ICP60

   Cobalt, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.8
   Maximum:	87.2
   Units:	parts per million by weight (ppm)

   Cr_ppm_ICP60

   Chromium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<10
   Maximum:	5013
   Units:	parts per million by weight (ppm)

   Cs_ppm_ICP60

   Cesium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.1
   Maximum:	113
   Units:	parts per million by weight (ppm)

   Cu_ppm_ICP60

   Copper, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<5
   Maximum:	2950
   Units:	parts per million by weight (ppm)

   Dy_ppm_ICP60

   Dysprosium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.4
   Maximum:	10.6
   Units:	parts per million by weight (ppm)

   Er_ppm_ICP60

   Erbium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.25
   Maximum:	6.6
   Units:	parts per million by weight (ppm)

   Eu_ppm_ICP60

   Europium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.1
   Maximum:	18.9
   Units:	parts per million by weight (ppm)

   Ga_ppm_ICP60

   Gallium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.40
   Maximum:	38.7
   Units:	parts per million by weight (ppm)

   Gd_ppm_ICP60

   Gadolinium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.32
   Maximum:	61.1
   Units:	parts per million by weight (ppm)

   Ge_ppm_ICP60

   Germanium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<1
   Maximum:	13
   Units:	parts per million by weight (ppm)

   Hf_ppm_ICP60

   Hafnium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.1
   Maximum:	30
   Units:	parts per million by weight (ppm)

   Ho_ppm_ICP60

   Holmium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.08
   Maximum:	2.16
   Units:	parts per million by weight (ppm)

   In_ppm_ICP60

   Indium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.18
   Maximum:	10.7
   Units:	parts per million by weight (ppm)

   La_ppm_ICP60

   Lanthanum, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.63
   Maximum:	5500
   Units:	parts per million by weight (ppm)

   Li_ppm_ICP60

   Lithium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.2
   Maximum:	173
   Units:	parts per million by weight (ppm)

   Lu_ppm_ICP60

   Lutetium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.05
   Maximum:	1
   Units:	parts per million by weight (ppm)

   Mn_ppm_ICP60

   Manganese, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	12
   Maximum:	10185
   Units:	parts per million by weight (ppm)

   Mo_ppm_ICP60

   Molybdenum, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.8
   Maximum:	257
   Units:	parts per million by weight (ppm)

   Nb_ppm_ICP60

   Niobium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.26
   Maximum:	278
   Units:	parts per million by weight (ppm)

   Nd_ppm_ICP60

   Neodymium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.91
   Maximum:	1830
   Units:	parts per million by weight (ppm)

   Ni_ppm_ICP60

   Nickel, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<5
   Maximum:	2011
   Units:	parts per million by weight (ppm)

   Pb_ppm_ICP60

   Lead, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2.6
   Maximum:	5532
   Units:	parts per million by weight (ppm)

   Pr_ppm_ICP60

   Praseodymium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.22
   Maximum:	670
   Units:	parts per million by weight (ppm)

   Rb_ppm_ICP60

   Rubidium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.4
   Maximum:	250
   Units:	parts per million by weight (ppm)

   Re_ppm_ICP60

   Rhenium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.02
   Maximum:	0.15
   Units:	parts per million by weight (ppm)

   Sb_ppm_ICP60

   Antimony, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.2
   Maximum:	554
   Units:	parts per million by weight (ppm)

   Sc_ppm_ICP60

   Scandium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2.9
   Maximum:	45
   Units:	parts per million by weight (ppm)

   Se_ppm_ICP60

   Selenium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.07
   Maximum:	16
   Units:	parts per million by weight (ppm)

   Sm_ppm_ICP60

   Samarium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.22
   Maximum:	123
   Units:	parts per million by weight (ppm)

   Sn_ppm_ICP60

   Tin, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<1
   Maximum:	8.3
   Units:	parts per million by weight (ppm)

   Sr_ppm_ICP60

   Strontium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	60
   Maximum:	2940
   Units:	parts per million by weight (ppm)

   Ta_ppm_ICP60

   Tantalum, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.5
   Maximum:	18
   Units:	parts per million by weight (ppm)

   Tb_ppm_ICP60

   Terbium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.06
   Maximum:	3.40
   Units:	parts per million by weight (ppm)

   Te_ppm_ICP60

   Tellurium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.05
   Maximum:	10.7
   Units:	parts per million by weight (ppm)

   Th_ppm_ICP60

   Thorium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.15
   Maximum:	111
   Units:	parts per million by weight (ppm)

   Tl_ppm_ICP60

   Thallium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.10
   Maximum:	12.4
   Units:	parts per million by weight (ppm)

   Tm_ppm_ICP60

   Thulium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.05
   Maximum:	0.98
   Units:	parts per million by weight (ppm)

   U_ppm_ICP60

   Uranium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.05
   Maximum:	48.8
   Units:	parts per million by weight (ppm)

   V_ppm_ICP60

   Vanadium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<5
   Maximum:	2344
   Units:	parts per million by weight (ppm)

   W_ppm_ICP60

   Tungsten, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.27
   Maximum:	95
   Units:	parts per million by weight (ppm)

   Y_ppm_ICP60

   Yttrium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2.34
   Maximum:	59.2
   Units:	parts per million by weight (ppm)

   Yb_ppm_ICP60

   Ytterbium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.3
   Maximum:	6.36
   Units:	parts per million by weight (ppm)

   Zn_ppm_ICP60

   Zinc, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	9.2
   Maximum:	6952
   Units:	parts per million by weight (ppm)

   Zr_ppm_ICP60

   Zirconium, in parts per million by weight, determined by 60 Element ICP-OES-MS, Sodium Peroxide Fusion (C_ICPOES_MS-60). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	5
   Maximum:	1345
   Units:	parts per million by weight (ppm)

   Al_pct_AR

   Aluminum, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.23
   Maximum:	1.16
   Units:	weight percent (% or pct)

   Ca_pct_AR

   Calcium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.10
   Maximum:	0.82
   Units:	weight percent (% or pct)

   Fe_pct_AR

   Iron, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.21
   Maximum:	3.92
   Units:	weight percent (% or pct)

   K_pct_AR

   Potassium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.19
   Maximum:	0.33
   Units:	weight percent (% or pct)

   Mg_pct_AR

   Magnesium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.04
   Maximum:	0.65
   Units:	weight percent (% or pct)

   Na_pct_AR

   Sodium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.02
   Maximum:	0.05
   Units:	weight percent (% or pct)

   S_pct_AR

   Sulfur, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.02
   Maximum:	0.49
   Units:	weight percent (% or pct)

   Ti_pct_AR

   Titanium, in weight percent, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	0.06
   Units:	weight percent (% or pct)

   Ag_ppm_AR

   Silver, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.36
   Maximum:	89.6
   Units:	parts per million by weight (ppm)

   As_ppm_AR

   Arsenic, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	15.1
   Maximum:	405
   Units:	parts per million by weight (ppm)

   Au_ppm_AR

   Gold, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.09
   Maximum:	11.3
   Units:	parts per million by weight (ppm)

   B_ppm_AR

   Boron, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<5
   Maximum:	68
   Units:	parts per million by weight (ppm)

   Ba_ppm_AR

   Barium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	91
   Maximum:	268
   Units:	parts per million by weight (ppm)

   Be_ppm_AR

   Beryllium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.15
   Maximum:	21.6
   Units:	parts per million by weight (ppm)

   Bi_ppm_AR

   Bismuth, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.11
   Maximum:	5.27
   Units:	parts per million by weight (ppm)

   Cd_ppm_AR

   Cadmium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.22
   Maximum:	27.0
   Units:	parts per million by weight (ppm)

   Ce_ppm_AR

   Cerium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	59.6
   Maximum:	132
   Units:	parts per million by weight (ppm)

   Co_ppm_AR

   Cobalt, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.21
   Maximum:	58.4
   Units:	parts per million by weight (ppm)

   Cr_ppm_AR

   Chromium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	8.41
   Maximum:	91.1
   Units:	parts per million by weight (ppm)

   Cs_ppm_AR

   Cesium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.56
   Maximum:	2.33
   Units:	parts per million by weight (ppm)

   Cu_ppm_AR

   Copper, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	9.53
   Maximum:	1223
   Units:	parts per million by weight (ppm)

   Ga_ppm_AR

   Gallium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.66
   Maximum:	5.53
   Units:	parts per million by weight (ppm)

   Ge_ppm_AR

   Germanium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.17
   Maximum:	0.31
   Units:	parts per million by weight (ppm)

   Hf_ppm_AR

   Hafnium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.08
   Maximum:	0.34
   Units:	parts per million by weight (ppm)

   Hg_ppm_AR

   Mercury, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.17
   Maximum:	8.31
   Units:	parts per million by weight (ppm)

   In_ppm_AR

   Indium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.01
   Maximum:	10.7
   Units:	parts per million by weight (ppm)

   La_ppm_AR

   Lanthanum, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	28.2
   Maximum:	59.8
   Units:	parts per million by weight (ppm)

   Li_ppm_AR

   Lithium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	5.50
   Maximum:	40.1
   Units:	parts per million by weight (ppm)

   Mn_ppm_AR

   Manganese, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	19
   Maximum:	3911
   Units:	parts per million by weight (ppm)

   Mo_ppm_AR

   Molybdenum, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	3.35
   Maximum:	66.9
   Units:	parts per million by weight (ppm)

   Nb_ppm_AR

   Niobium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.12
   Maximum:	7.25
   Units:	parts per million by weight (ppm)

   Ni_ppm_AR

   Nickel, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	7.60
   Maximum:	225
   Units:	parts per million by weight (ppm)

   P_ppm_AR

   Phosphorus, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	280
   Maximum:	700
   Units:	parts per million by weight (ppm)

   Pb_ppm_AR

   Lead, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	8.96
   Maximum:	4146
   Units:	parts per million by weight (ppm)

   Rb_ppm_AR

   Rubidium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	7.48
   Maximum:	28.3
   Units:	parts per million by weight (ppm)

   Re_ppm_AR

   Rhenium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.001
   Maximum:	0.023
   Units:	parts per million by weight (ppm)

   Sb_ppm_AR

   Antimony, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2.13
   Maximum:	435
   Units:	parts per million by weight (ppm)

   Sc_ppm_AR

   Scandium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.8
   Maximum:	3.9
   Units:	parts per million by weight (ppm)

   Se_ppm_AR

   Selenium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.71
   Maximum:	18.7
   Units:	parts per million by weight (ppm)

   Sn_ppm_AR

   Tin, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.87
   Maximum:	3.8
   Units:	parts per million by weight (ppm)

   Sr_ppm_AR

   Strontium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	12.8
   Maximum:	48.0
   Units:	parts per million by weight (ppm)

   Ta_ppm_AR

   Tantalum, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	0.02
   Units:	parts per million by weight (ppm)

   Te_ppm_AR

   Tellurium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.06
   Maximum:	9.71
   Units:	parts per million by weight (ppm)

   Th_ppm_AR

   Thorium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	8.54
   Maximum:	18
   Units:	parts per million by weight (ppm)

   Tl_ppm_AR

   Thallium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.28
   Maximum:	9.86
   Units:	parts per million by weight (ppm)

   U_ppm_AR

   Uranium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.51
   Maximum:	2.53
   Units:	parts per million by weight (ppm)

   V_ppm_AR

   Vanadium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	13.4
   Maximum:	72.5
   Units:	parts per million by weight (ppm)

   W_ppm_AR

   Tungsten, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.55
   Maximum:	11.2
   Units:	parts per million by weight (ppm)

   Y_ppm_AR

   Yttrium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	10.7
   Maximum:	24.8
   Units:	parts per million by weight (ppm)

   Zn_ppm_AR

   Zinc, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	14.3
   Maximum:	3711
   Units:	parts per million by weight (ppm)

   Zr_ppm_AR

   Zirconium, in parts per million by weight, determined by ICP-OES-MS after an Aqua Regia Digestion (C_AQUA_REGIA). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2.0
   Maximum:	8.1
   Units:	parts per million by weight (ppm)

   Au_ppb_FA

   Gold, in parts per billion by weight, determined by ICP-OES-MS after a lead fusion fire assay (C_FA_ICPMS-AU or C_FA_AU-PD-PT). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.6
   Maximum:	5504
   Units:	parts per billion by weight (ppb)

   Pd_ppb_FA

   Palladium, in parts per billion by weight, determined by ICP-OES-MS after a lead fusion fire assay (C_FA_AU-PD-PT). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.0
   Maximum:	485
   Units:	parts per billion by weight (ppb)

   Pt_ppb_FA

   Platinum, in parts per billion by weight, determined by ICP-OES-MS after a lead fusion fire assay (C_FA_AU-PD-PT). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.6
   Maximum:	166
   Units:	parts per billion by weight (ppb)

   Al2O3_pct_WDX

   Aluminum, reported as aluminum oxide or alumina (Al2O3) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.31
   Maximum:	21.0
   Units:	weight percent (% or pct)

   BaO_pct_WDX

   Barium, reported as barium oxide or baria (BaO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.005
   Maximum:	4.24
   Units:	weight percent (% or pct)

   CaO_pct_WDX

   Calcium, reported as calcium oxide or quicklime (CaO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.19
   Maximum:	46.7
   Units:	weight percent (% or pct)

   Cr2O3_pct_WDX

   Chromium, reported as chromium(III) oxide or chromia (Cr2O3) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.002
   Maximum:	0.74
   Units:	weight percent (% or pct)

   Fe2O3_pct_WDX

   Total iron (regardless of the oxidation state), reported as iron(III) oxide or ferric oxide (Fe2O3) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.28
   Maximum:	13.8
   Units:	weight percent (% or pct)

   K2O_pct_WDX

   Potassium, reported as potassium oxide (K2O) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.02
   Maximum:	5.4
   Units:	weight percent (% or pct)

   LOI_pct_WDX

   Loss on ignition (LOI), in weight percent, determined by gravimetry (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	79.9
   Units:	weight percent (% or pct)

   MgO_pct_WDX

   Magnesium, reported as magnesium oxide or magnesia (MgO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.07
   Maximum:	21
   Units:	weight percent (% or pct)

   MnO_pct_WDX

   Manganese, reported as manganese(II) oxide (MnO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.002
   Maximum:	1.32
   Units:	weight percent (% or pct)

   Na2O_pct_WDX

   Sodium, reported as sodium oxide (Na2O) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.03
   Maximum:	9.03
   Units:	weight percent (% or pct)

   P2O5_pct_WDX

   Phosphorus, reported as phosphorus pentoxide (P2O5) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	1.0
   Units:	weight percent (% or pct)

   SiO2_pct_WDX

   Silicon, reported as silicon dioxide or silica (SiO2) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1.03
   Maximum:	79.8
   Units:	weight percent (% or pct)

   SrO_pct_WDX

   Strontium, reported as strontium oxide or strontia (SrO) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	<0.01
   Maximum:	0.35
   Units:	weight percent (% or pct)

   TiO2_pct_WDX

   Titanium, reported as titanium dioxide or titania (TiO2) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.02
   Maximum:	2.80
   Units:	weight percent (% or pct)

   V2O5_pct_WDX

   Vanadium, reported as vanadium pentoxide or vanadia (V2O5) in weight percent, determined by WDXRF (C_WDXRF-MAJORS). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.004
   Maximum:	0.42
   Units:	weight percent (% or pct)

   F_pct_ISE

   Fluoride anion (F-), in weight percent, determined by ion-selective electrode following a sodium hydroxide fusion (C_ISE-F). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.04
   Maximum:	0.34
   Units:	weight percent (% or pct)

   S_pct_IR

   Total sulfur, in weight percent, determined by combustion followed by LECO infrared detection (S_pct_IR). Expected GRM values below or above normal detection limits may be expressed with a 'less than' (<) or 'greater than' (>) symbol, respectively. A blank or NULL value indicates that no data are available. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.006
   Maximum:	5.84
   Units:	weight percent (% or pct)

   Entity_and_Attribute_Overview:

   EMRI_Data_v07_20220831.accdb is a Microsoft Access database containing the tables EMRI_Data, Limits_AnalyticalMethods, and QAQC_Values. It is duplicate content of the .csv files of the same names. It is provided for the convenience of those users who prefer the .accdb format.

   Entity_and_Attribute_Detail_Citation:

   EMRI_Data_v07_20220831.accdb is included in the 'Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative' data release on ScienceBase (https://doi.org/10.5066/P9WHRLXH).

   Entity_and_Attribute_Overview:

   EMRI_DataDictionary.csv is a data dictionary that partially describes the attributes for the 3 tables in this data release (EMRI_Data.csv, Limits_AnalyticalMethods.csv, and QAQC_Values.csv). It is a duplication of content in the 'Entity and Attributes' section of this metadata record and is provided for the convenience of the user.

   Entity_and_Attribute_Detail_Citation:

   EMRI_DataDictionary.csv is included in the 'Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative' data release on ScienceBase (https://doi.org/10.5066/P9WHRLXH).

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey
2. Who also contributed to the data set?

   This data release was funded by the USGS Earth Mapping Resources Initiative (Earth MRI). Geochemical data were compiled by the USGS Geology, Geophysics, and Geochemistry Science Center. Contributors include: Steven M Smith ORCID: https://orcid.org/0000-0003-3591-5377; Michaela Johnson ORCID: https://orcid.org/0000-0001-6133-0247; Jaime Azain ORCID: https://orcid.org/0000-0002-8256-7494; Zachary Bueghly ORCID: https://orcid.org/0000-0002-1117-6082; Andrew Ingraham ORCID: https://orcid.org/0000-0001-7347-6171; Warren Day ORCID: https://orcid.org/0000-0002-9278-2120

3. To whom should users address questions about the data?
   Steven M Smith

   U.S. Geological Survey

   Geologist

   PO Box 25046, Mail Stop 973, W 6th Ave Kipling St

   Lakewood, CO
   

   US

   303-236-1192 (voice)

   smsmith@usgs.gov

Why was the data set created?

The goal of Earth MRI is to improve our knowledge of the geologic framework in the United States and to identify areas that may have the potential to contain undiscovered critical mineral resources. Enhancement of our domestic mineral supply will decrease the Nation’s reliance on foreign sources of minerals that are fundamental to our security and economy. These geochemical data were collected to support regional synthesis/synoptic surveys and geologic mapping by individual projects funded by Earth MRI.

How was the data set created?

1. From what previous works were the data drawn?

   NGDB (source 1 of 2)

   Smith, Steven M., 2016, National Geochemical Database (NGDB): U.S. Geological Survey, Denver, CO.

   Online Links:

   • https://mrdata.usgs.gov/ngdb

   Type_of_Source_Media:

   Database of geochemical results and sample descriptive information for historic USGS samples

   Source_Contribution:

   Used to provide sample descriptive data for samples pulled from the USGS National Geochemical Sample Archive

   AGDB3 (source 2 of 2)

   Granitto, M., Wang, B., Shew, N.B., Karl, S.M., Labay, K.A., Werdon, M.B., Seitz, S.S., and Hoppe J.E., 20200630, Alaska Geochemical Database Version 3.0 (AGDB3) including best value data compilations for rock, sediment, soil, mineral, and concentrate sample media: U.S. Geological Survey, Denver, CO.

   Online Links:

   • https://doi.org/10.5066/P98NHRAD

   Type_of_Source_Media:

   Database of geochemical results and sample descriptive information for historic USGS samples collected in Alaska

   Source_Contribution:

   Used to provide sample descriptive data for samples pulled from the USGS National Geochemical Sample Archive

2. How were the data generated, processed, and modified?

   Date: 2020 (process 1 of 12)

   Sample Collection, Identification, and Submittal: Each Earth MRI affiliated agency was responsible for the collection of new samples, the acquisition of archived samples from State, industrial, or private collections, or the identification of samples stored in and pulled from the USGS National Geochemical Sample Archive. They were also responsible for providing sample collection, sample description, and sample location information in a specified spreadsheet format when submitting samples to the USGS for analysis. Once received by the USGS, submitted samples were logged into the Laboratory Information Management System (LIMS), prepared, and sent to the laboratories for analysis. The accompanying sample descriptive and location data were collated and stored in a digital database table.

   Date: 2020 (process 2 of 12)

   Sample Preparation: Samples submitted to the USGS were prepared before sending them to the laboratories for analysis. Unless otherwise requested, samples were prepared using standard methodology. Rock samples were crushed and then a representative split of the material was ground in a shatterbox or ball mill using agate or aluminum corundum containers to -200 mesh (<75 microns) to ensure complete digestion of the sample when it was analyzed. Sediment samples were air-dried, sieved to a specified size fraction, and then ground in a vertical grinder with ceramic plates to -150 mesh (<100 microns). Soil samples were air-dried, disaggregated, sieved to a specified size fraction, and then ground in a vertical grinder with ceramic plates to -150 mesh. Previously-ground sample pulps pulled from the USGS National Geochemical Sample Archive were re-ground in a vertical grinder with ceramic plates to -150 mesh to ensure a uniform fineness of material.

   Date: 2020 (process 3 of 12)

   Sample Analysis and Methods: Every sample submitted to AGAT Laboratories, LTD (AGAT) was analyzed, at a minimum, by a total digestion, 60- or 61-element method using inductively coupled plasma-optical emission spectrometry (ICP-OES) and inductively coupled plasma-mass spectrometry (ICP-MS). Most samples were also analyzed for major element oxides by wavelength dispersive x-ray fluorescence spectrometry (WDXRF) and a subset were analyzed by additional methods. Descriptions of the methods used (and their method codes) are as follows:

   C_ICPOES_MS-60: Sixty or sixty-one elements (Al, Ca, Fe, K, Mg, P, S, Si, Ti, Ag, As, B, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho, In, La, Li, Lu, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Re, Sb, Sc, Se, Sm, Sn, Sr, Ta, Tb, Te, Th, Tl, Tm, U, V, W, Y, Yb, Zn, Zr) are determined in rocks, minerals, sediments, and soils. Samples are fused at 750°C with sodium peroxide and the fusion cake dissolved in a dilute nitric acid. The resulting solution is analyzed by ICP-OES and ICP-MS. Data are deemed acceptable if recovery for all elements is ±15% at five times the Lower Detection Limit and the calculated Relative Standard Deviation (RSD) of duplicate samples is no greater than 15%.

   C_WDXRF-MAJORS: Major elements are determined by WDXRF and reported as major element oxides (SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, P2O5, BaO, Cr2O3, SrO, V2O5). The sample is fused with lithium metaborate/lithium tetraborate flux and the resultant glass disk is introduced into the WDXRF and irradiated by an x-ray tube. The method also provides a gravimetric loss on ignition (LOI). Data are deemed acceptable when recovery of each major oxide is ±5% at five times the Lower Detection Limit and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 5%.

   C_FA_ICPMS-AU: Gold is determined by lead fusion and by ICP-OES and ICP-MS after collection by fire assay. The sample is mixed with fluxing agents to assist with melting and promote separation of waste (gangue) materials from the precious metals. After cooling, the gangue is separated and discarded as a glassy slag from the precious metal-containing lead button. This button is further heated on an absorbing magnesium oxide crucible to remove the lead and trace amounts of base metals. A small silver prill is left containing the precious metals. The silver prill is digested in aqua regia and then analyzed by ICP-OES and ICP-MS. Lower concentrations of Gold are measured by ICP-MS. Higher concentrations are measured by ICP-OES. Data are deemed acceptable when recovery of Gold is ±20% at five times the Lower Detection Limit and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 20%.

   C_FA_AU-PD-PT: Gold, Palladium, and Platinum are determined by lead fusion and by ICP-OES and ICP-MS after collection by fire assay. The sample is mixed with fluxing agents to assist with melting and promote separation of waste (gangue) materials from the precious metals. After cooling, the gangue is separated and discarded as a glassy slag from the precious metal-containing lead button. This button is further heated on an absorbing magnesium oxide crucible to remove the lead and trace amounts of base metals. A small silver prill is left containing the precious metals. The silver prill is digested in aqua regia then analyzed by ICP-OES and ICP-MS. Data are deemed acceptable if recovery of Gold, Palladium, and Platinum is ±20% at five times the Lower Detection Limit and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 20%.

   C_ISE-F: Fluoride is determined by ion-selective electrode (ISE) following a sodium hydroxide fusion. The sample is fused with a mixture of sodium hydroxide, potassium nitrate and silica to release fluoride ions from the sample matrix followed by dissolution of the fusion cake in dilute nitric acid. Prior to measuring the fluoride activity of the sample solution using an ion-selective electrode, an ammonium citrate solution is added to buffer the pH, maintain a constant ionic strength, and dissociate any metal ion-fluoride complexes. The fluoride concentration in the sample is then determined by interpolation from standard calibration curves. Data are deemed acceptable when recovery of Fluoride is ±20% at five times the Lower Detection Limit and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 20%.

   C_TOTAL-S: Total Sulfur is determined in geologic materials by combustion followed by infrared detection on LECO instrumentation. A weighed sample is mixed with an accelerator and heated via an induction furnace to oxidize sulfur to sulfur dioxide. Moisture and dust are removed, and the sulfur dioxide gas is then measured by a solid-state infrared detector. Data are deemed acceptable when recovery of Total Sulfur is ±15% at five times the Lower Detection Limit and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 15%.

   C_AQUA_REGIA: The sample is digested with aqua regia [nitric acid (HNO3) and hydrochloric acid (HCl)] and heated in a water bath for 1.5 hours at 85°C. The sample is then cooled to room temperature and analyzed by ICP-OES and ICP-MS for 51 elements (Al, Ca, Fe, K, Mg, Na, S, Ti, Ag, As, Au, B, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Ga, Ge, Hf, Hg, In, La, Li, Mn, Mo, Nb, Ni, P, Pb, Rb, Re, Sb, Sc, Se, Sn, Sr, Ta, Te, Th, Tl, U, V, W, Y, Zn, Zr). Data are deemed acceptable when recovery for all 51 elements is ±15% at five times the Lower Detection Limit and the calculated Relative Standard Deviation (RSD) of duplicate samples is no greater than 15%.

   Date: 2020 (process 4 of 12)

   Quality Assurance/Quality Control and Data Approval: AGAT Laboratories, LTD is accredited to ISO/IEC 17025:2005 and certified to the ISO 9001:2008 standard. The laboratory’s quality control protocol is to insert a reagent blank and a reference sample material sample with every batch of 20 samples to measure the analytical accuracy. Duplicate samples were analyzed at the end of the sample set to measure analytical variance as well as sample variance. Data passing the laboratory’s quality control criteria were sent to the USGS and then imported into the Laboratory Information Management System (LIMS).

   All samples submitted to AGAT were accompanied with a set of USGS in-house geologic reference samples (GRMs) submitted blind to the laboratory at the rate of 10%. Using a program within the LIMS, a USGS Analytical Chemistry Quality Control Reviewer evaluated the data for the reference samples by comparing the “obtained” analytical value to the “expected” value for each element. The values must fall within the range of acceptance, which varies between ± 5% to ±20% depending on the analytical method. Analytical results for samples associated with the accepted quality control data were then released to the sample submitter and approved for release in this data product. Samples associated with rejected quality control data were re-analyzed by AGAT Laboratories until the resultant data were found to be “in control.” In addition to the GRMs, at least one randomly chosen sample per job was split and submitted blind to the laboratory as an analytical duplicate.

   Date: 31-Dec-2020 (process 5 of 12)

   Preparation and Compilation of Data for Release: Analytical data results for samples submitted by Earth MRI collaborative projects, analyzed by USGS contract laboratories, and approved for release by a USGS Analytical Chemistry Quality Control Reviewer were pulled from the Laboratory Information Management System (LIMS). These records were merged with sample descriptive and location information previously provided by collaborative entities when the samples were submitted for analysis. Original latitude-longitude coordinates were converted, when necessary, to the WGS84 datum and then recorded in the Lat_WGS84 and Long_WGS84 fields. Sample preparation information obtained from sample submittal requests and Sample Control was consolidated and summarized in the Sample_Prep field. Analytical methods used on the samples were summarized by laboratory code in the Analytic_Mthds field. Samples of USGS geologic reference materials and analytical duplicates were identified in the QAQC_Sample field. Earth MRI projects and affiliated agencies were identified and recorded in the PID, Proj_Name, and Affiliation fields.

   This initial version of the “Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative” data release consists of 4,772 geochemical data records (including data for associated GRMs) that were approved for public release between April 14, 2020 and December 31, 2020. Person who carried out this activity:
   

   Steven M Smith

   U.S. Geological Survey

   Geologist

   PO Box 25046, Mail Stop 973, W 6th Ave Kipling St

   Lakewood, CO
   

   US

   303-236-1192 (voice)

   smsmith@usgs.gov

   Date: 31-Mar-2021 (process 6 of 12)

   Version 2.0 Update: Added 388 new geochemical records (Lab_ID's C-515082 through C-515157; C-515295 through C-515376; C-516824 through C-516913; C-517634 through C-517667; and C-517852 through C-517957) that were approved for public release between January 1, 2021 and March 31, 2021. Updated previously released records by adding results from new major element oxide analyses (C_WDXRF-MAJORS) to 1,132 records in 29 jobs (Job_IDs = MRP-18672, MRP-18673, MRP-18674, MRP-18675, MRP-18676, MRP-18677, MRP-18678, MRP-18679, MRP-18680, MRP-18685, MRP-18686, MRP-18687, MRP-18704, MRP-18718, MRP-18719, MRP-18720, MRP-18721, MRP-18722, MRP-18723, MRP-18724, MRP-18727, MRP-18728, MRP-18729, MRP-18730, MRP-18731, MRP-18732, MRP-18733, MRP-18734, MRP-18740). Laboratory corrections for major element oxide analyses (C_WDXRF-MAJORS) were received and updated for records with Job_ID = MRP-18769. Updated the QAQC_Values table with data for additional Geological Reference Materials. Version 2.0 of the CSV text file dataset and Microsoft Access database file now contains 5,160 records for Earth MRI-funded samples: 4,699 user-submitted sample or reference material records with coordinates plus 461 USGS GRMs without coordinates.

   Date: 31-Jul-2021 (process 7 of 12)

   Version 3.0 Update: Added 323 new geochemical records from 11 new jobs (Job_ID's MRP-19076, MRP-19094 through MRP-19099, MRP-19106, MRP-19114, MRP-19127, and MRP-19128) that were approved for public release between April 1, 2021 and July 31, 2021. Updated the QAQC_Values table with data for additional Geological Reference Materials. Version 3.0 of the CSV text file dataset and Microsoft Access database file now contains 5,483 records for Earth MRI-funded samples: 4,994 user-submitted sample or reference material records with coordinates plus 489 USGS GRMs without coordinates.

   Date: 31-Oct-2021 (process 8 of 12)

   Version 4.0 Update: Added 1,020 new geochemical records from 28 new jobs (Job_ID's MRP-18995 through MRP-18998, MRP-19130, MRP-19145, MRP-19152 through MRP-19155, MRP-19161, MRP-19166, MRP-19168 through MRP-19170, MRP-19180, MRP-19182, MRP-19183, MRP-19221, MRP-19222, MRP-19236, MRP-19256, MRP-19257, and MRP-19285 through MRP-19289) that were approved for public release between Aug 1, 2021 and October 31, 2021. Updated the QAQC_Values table with data for additional Geological Reference Materials. Version 4.0 of the CSV text file dataset and Microsoft Access database file now contains 6,503 records for Earth MRI-funded samples: 5,927 sample records with coordinates and 576 GRMs without coordinates.

   Date: 28-Feb-2022 (process 9 of 12)

   Version 5.0 Update: Added 605 new geochemical records from 20 new jobs (Job_ID's MRP-19334, MRP-19342, MRP-19348 through MRP-19352, MRP-19360, MRP-19369, MRP-19370, MRP-19383 through MRP-19385, MRP-19445, MRP-19447, and MRP-19454 through MRP-19458) that were approved for public release between November 1, 2021 and February 28, 2022. Updated the QAQC_Values table with data for additional Geological Reference Materials. Version 5.0 of the CSV text file dataset and Microsoft Access database file now contains 7,108 records for Earth MRI-funded samples: 6,482 sample records with coordinates and 626 GRMs without coordinates.

   Date: 31-May-2022 (process 10 of 12)

   Version 6.0 Update: Added 742 new geochemical records from 16 new jobs (Job_ID's MRP-19459 through MRP-19461, MRP-19463 through MRP-19474, and MRP-19545) that were approved for public release between March 1, 2022 and May 31, 2022. Updated the QAQC_Values table with data for additional Geological Reference Materials. Version 6.0 of the CSV text file dataset and Microsoft Access database file now contains 7,850 records for Earth MRI-funded samples: 7,162 sample records with coordinates and 688 GRMs without coordinates.

   Date: Jun-2022 (process 11 of 12)

   For data reported June 2022, the analytical laboratory changed the lower or upper detection limits for 10 elements analyzed by the C_AQUA_REGIA analytical method. The changed values are documented in two new fields (LowerDL2 and UpperDL2) in the Limits_AnalyticalMethods table.

   Date: 31-Aug-2022 (process 12 of 12)

   Version 7.0 Update: Added 1,617 new geochemical records from 48 new jobs (Job_ID's MRP-19100 through MRP-19102, MRP-19294, MRP-19295, MRP-19306, MRP-19307, MRP-19347, MRP-19388, MRP-19449 through MRP-19453, MRP-19475, MRP-19511, MRP-19546 through MRP-19548, MRP-19550, MRP-19551, MRP-19559 through MRP-19564, MRP-19567, MRP-19568, MRP-19570 through MRP-19572, MRP-19586 through MRP-19589, MRP-19591 through MRP-19598, MRP-19646, MRP-19647, MRP-19652, and MRP-19653) that were approved for public release before August 31, 2022. Updated the QAQC_Values table with data for additional Geological Reference Materials. Version 7.0 of the CSV text file dataset and Microsoft Access database file now contains 9,467 records for Earth MRI-funded samples: 8,642 sample records with coordinates and 825 GRMs without coordinates.

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   1) Sample Descriptive Information: Descriptive information for each sample is provided by the sample submitter at the time when the samples are sent to Sample Control for preparation and geochemical analysis. Thus, some of the information is preliminary. For example, the specific rock name for igneous samples may be based on initial field observations and may not be consistent with the final analytical results provided here. The sample descriptive information is as complete and accurate as was provided during submittal. No attempt was made to go back and supplement or correct any fields unless errors were identified by the original submitter. Some of the samples submitted for reanalysis were retrieved from the USGS National Geochemical Sample Archive. The sample descriptive information for these previously submitted samples was derived from data compilations such as the National Geochemical Database (https://mrdata.usgs.gov/ngdb/) or the Alaska Geochemical Database v.3.0 (Granitto & others, 2019; https://doi.org/10.5066/P98NHRAD)
   2) Analytical Data: All analytical data in this data release come from recently completed analyses at AGAT Laboratories Ltd. under contract with the USGS. AGAT Laboratories is accredited to ISO/IEC 17025:2005 and certified to the ISO 9001:2008 standard. The accuracy of the analytical data was evaluated and confirmed by the use of Geologic Reference Materials (GRMs) and Quality Assurance/Quality Control (QA/QC) measures. The laboratory inserted a reagent blank and an internal GRM with every batch of 20 samples. Within every job of samples submitted to the laboratory, the USGS inserted a set of USGS in-house GRMs at the rate of 10% that were blind to the laboratory. Specific GRMs were chosen based on the sample media and requested analytical methods since GRMs often lack expected values for certain elements or constituents and may not be useful for every analytical method. In addition to the GRMs, at least one randomly chosen sample per job was split and submitted blind to the laboratory as an analytical duplicate. All USGS GRMs, as well as the original and duplicate analytical split samples are included and identified herein. “Preferred” and “Mean” values for USGS GRMs used for Earth MRI projects are included in the QAQC_Values table. A full description of the QA/QC process is given in this metadata file within the Quality Assurance/Quality Control and Data Approval process step.
   Additional reference materials are sometimes included by the submitter and although they may be identified as such in the data, these were not included in the quality control assessment used to approve the data returned by the laboratory, nor were expected values for these reference materials included in the QAQC_Values table.
   3) Informational Values: The ICPOES_MS-60 analytical results for boron (B) and rhenium (Re) are considered to be informational. Boron is informational since there are few reference materials with the certified B values needed to reliably characterize the performance. Rhenium is informational since there is not an established preferred value for the USGS reference materials and there is insufficient available data to calculate means for meaningful comparisons. In addition to these elements, there are no established preferred values for these reference materials when analyzed by the recently added C_AQUA_REGIA partial leach method. Results were compared to averages taken from a small sample size and may not be a reliable indicator of method performance. Laboratory replicates and reference materials performed adequately for all fields with informational values.
   4) Detection Limits: Despite advances in analytical methods and instrumentation, some element concentrations still fall outside the method's Lower and Upper Detection Limits. (See the Limits_AnalyticalMethods table for a list of all Lower and Upper Detection Limits by analytical method.) The lab reported all values falling below a Lower Detection Limit with a 'less than' symbol (<). In this dataset, all < symbols have been replaced with a negative value symbol (-). Thus, a value of -0.5 ppm Cd should be read as <0.5 ppm Cd.
   By contractual agreement with the laboratory, all samples with a concentration value that exceeded an analytical method's Upper Detection Limit were diluted and analyzed a second time to give a real value rather than a 'greater than' (>) value. For example, a zinc (Zn) value exceeding the ICPOES_MS-60 method’s Upper Detection Limit of >50,000 ppm Zn was reanalyzed in a diluted solution to return a value of 92,500 ppm Zn. However, on rare occasions a 'greater than' value was reported rather than a real value determined by reanalyzing a diluted solution. These are identified by a 1111 suffix. For example, a value reported only as >10000 ppm Ba is identified with the replaced value of 10000.1111 and a value reported only as >40.0% Si is identified with the replaced value of 40.01111
2. How accurate are the geographic locations?
   1) Coordinates: This data set contains geographic latitude-longitude coordinates determined by two very different methods. (i) Prior to the expanded civilian use (before ~2000) of the Global Positioning System (GPS), sample site coordinates were determined directly from hand-plotted sites on paper topographic quadrangle maps (usually 1:24,000 or 1:62,500 scale). Thus, the accuracy of these coordinates depends on the scale of the base map used and the accuracy at which the location was hand plotted on the map. The coordinate values were then determined either by using page-sized transparent 10-second grid overlays to estimate the position to the nearest second or by using a digitizing board. Coordinates determined by pre-GPS methods are generally accurate to approximately 2 seconds (60 meters) or better. Those originally reported in degrees, minutes, seconds format have been converted to decimal degree units and are usually reported to 3 or 4 decimal places. (ii) Once GPS units were in common use, coordinates were recorded digitally on site. GPS-derived coordinates are generally accurate to 5 meters or better and are usually reported as decimal degrees to 5 decimal places.
   All coordinates, as reported originally by the submitter or from compiled historic geochemical databases, are given in the Orig_Lat and Orig_Long fields and accompanied by the original datum used in the Orig_Datum field. Decimal degree coordinates were originally reported to 3, 4, or 5 decimal places. The implied accuracy of these values is approximately 100 meters for 0.001 degree, 10 meters for 0.0001 degree, and 1 meter for 0.00001 degree.
   2) Datum and Earth Ellipsoid or Spheroid: The samples submitted were originally projected, located, and reported using a few different datums (Examples: NAD27, NAD83, WGS84). This original datum is recorded in the Orig_Datum field. Based on the value in the Orig_Datum field, all sample site coordinates were converted, when necessary, to the WGS84 datum and recorded in the Lat_WGS84 and Long_WGS84 fields.
3. How accurate are the heights or depths?
   No formal positional accuracy tests were conducted. Sample depth values were accepted as provided by the sample submitter. No elevation information is included in this dataset.
4. Where are the gaps in the data? What is missing?
   This dataset contains all the sample descriptive information and geochemical data currently approved for release for geological samples submitted by Earth MRI projects. Updates will be released periodically as additional data are approved for release.
   Every sample was submitted, at a minimum, for total digestion analyses by the 60-element ICP-OES/ICP-MS method (C_ICPOES_MS-60). Most samples were also analyzed for major element oxides by WDXRF (C_WDXRF-MAJORS) and a subset were analyzed by additional methods. No sample was analyzed for every element or constituent by every available method and, therefore, each sample record has fields that have no data. Fields with no available data were left blank. Occasionally, in a job of samples submitted for a set requested analyses, a sample was submitted without enough mass to allow for all of the requested analyses to be completed. Fields where the sample was of insufficient size to be analyzed are also blank since no data were available.
   There are no analytical data fields with values of zero (0). Some software programs have been known to assign values of zero when importing data with blank fields. If the user encounters zero values in the data, it is recommended that they check the import parameters of their software to ensure that blank fields remain blank or are recognized as “Null” fields when imported into a different data format.
5. How consistent are the relationships among the observations, including topology?
   Each data record in this release represents a single sample with sample location information, sample/site descriptive information, and analytical data. Each record is identified by a unique laboratory-assigned ID (Lab_ID) and the original ID assigned to the sample when collected in the field (Field_ID) or pulled from the USGS National Geochemical Sample Archive. Since samples were submitted by multiple entities, there is no guarantee that the Field_ID is unique within the entire dataset. Each sample was submitted in a job (with a unique Job_ID) consisting of no more than 50 samples.
   As part of the quality control methodology, each job of samples includes a set of USGS in-house geologic reference samples (GRMs) submitted blind to the laboratory. Data records for USGS GRMs are identified by name in the QAQC field. Additionally, at least one sample within each job (Job_ID) was split and analyzed twice. The original sample is identified in the QAQC field as 'Original' and the second split is identified in this field as 'Duplicate'.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None. Please see ‘Distribution Information’ for details.
Use_Constraints:

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.

1. Who distributes the data set? (Distributor 1 of 1)
   
   USGS ScienceBase

   U.S. Geological Survey

   Denver Federal Center, Building 810, Mail Stop 302

   Denver, CO
   

   United States

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set?
3. What legal disclaimers am I supposed to read?

   Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	A Microsoft Access database file containing the tables EMRI_Data, and Limits_AnalyticalMethods, and QAQC_Values. It is duplicate content of the .csv files of the same names. It is provided for the convenience of those users who prefer the .accdb format. in format ACCDB (version Microsoft Access 2010)
     Network links:	https://doi.org/10.5066/P9WHRLXH

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 08-Nov-2022

Metadata author:

Steven M Smith

U.S. Geological Survey

Geologist

PO Box 25046, Mail Stop 973, W 6th Ave Kipling St

Lakewood, CO

US

303-236-1192 (voice)

smsmith@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)