1. Mineral Resources
  2. Online Spatial Data

The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Illinois

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Illinois
Abstract:
These metadata are specifically for the State of Illinois, one state in the national compilation of state geologic map databases. The digital geologic map data was prepared by Illinois Natural Resources Geospatial Data Clearinghouse. Subsequent editing of the spatial data by the USGS was limited to fitting a standardized state boundary to the data, standardizing the arc coding, reprojecting the data, and minor edits of arc or polygon attributes to conform with the paper map. This open-file report is one of several that present the preliminary results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geoenvironmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in CONUSdocumentationMW.pdf, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii.
Supplemental_Information:
This database consists of five major Arc/Info GIS datasets for each state; - one: geologic map with formations, - two: faults (where present), - three: dikes (where present), - four: miscellaneous line features (where present), - five: miscellaneous point features (where present).

  1. How might this data set be cited?
    Nicholson, Suzanne W., Dicken, Connie L., Foose, Michael P., and Mueller, Julia, 2004, The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Illinois: U.S. Geological Survey Open-File Report 2004-1355, U.S. Geological Survey, Reston, VA.

    Online Links:

    This is part of the following larger work.

    Nicholson, Suzanne W., Dicken, Connie L., Foose, Michael P., and Mueller, Julia A.L., 2004, Integrated geologic map databases for the United States: The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana: U.S. Geological Survey Open-File Report 2004-1355, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -91.86258638
    East_Bounding_Coordinate: -86.79863184
    North_Bounding_Coordinate: 42.86272148
    South_Bounding_Coordinate: 36.83233566
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2004
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set.
    2. What coordinate system is used to represent geographic features?
      The map projection used is Lambert Conformal Conic.
      Projection parameters:
      Standard_Parallel: 33
      Standard_Parallel: 45
      Longitude_of_Central_Meridian: -100.0
      Latitude_of_Projection_Origin: 0
      False_Easting: 0.00000
      False_Northing: 0.00000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.01
      Ordinates (y-coordinates) are specified to the nearest 0.01
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    il_geol.pat
    Polygon attribute table for the Illinois geologic coverage. (Source: ESRI)
    orig_label
    unmodified map unit symbol from source cover.

    type: character width: 12 output width: 12 (Source: IL001)
    ValueDefinition
    1200T = Tertiary
    1360K = Cretaceous
    1550PAma = Mattoon Formation
    1880PAb = Bond Formation
    2120PAm = Modesto Formation
    2480PAc = Carbondale Formation
    3030PAs = Spoon Formation
    3540PAa = Abbott Formation
    3820PAcv = Caseyville Formation
    4025Mcu = Upper Chesterian (Grove Church - Tar Springs)
    4265Mcl = Lower Chesterian (Glen Dean - Renault)
    5005Mvu = Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis)
    5175Mvm = Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east)
    5255Mvl = Lower Valmeyeran (Keokuk-Sedalia)
    5420Mk = Kinderhookian
    5810Du = Upper Devonian
    5880Dm = Middle Devonian
    6170Dl = Lower Devonian
    6700S = Silurian
    7390Om = Maquoketa
    7550Og = Galena-Platteville
    8160Oa = Ancell
    8420Op = Prairie du Chien
    8550CA = Cambrian
    waterwater
    sgmc_label
    orig_label + ;n where n= province number (n=0 if no province number)

    type: character width: 16 output width: 16 (Source: Doug Stoeser)
    ValueDefinition
    T;0T = Tertiary
    K;0K = Cretaceous
    PAma;0PAma = Mattoon Formation
    PAb;0PAb = Bond Formation
    PAm;0PAm = Modesto Formation
    PAc;0PAc = Carbondale Formation
    PAs;0PAs = Spoon Formation
    PAa;0PAa = Abbott Formation
    PAcv;0PAcv = Caseyville Formation
    Mcu;0Mcu = Upper Chesterian (Grove Church - Tar Springs)
    Mcl;0Mcl = Lower Chesterian (Glen Dean - Renault)
    Mvu;0Mvu = Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis)
    Mvm;0Mvm = Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east)
    Mvl;0Mvl = Lower Valmeyeran (Keokuk-Sedalia)
    Mk;0Mk = Kinderhookian
    Du;0Du = Upper Devonian
    Dm;0Dm = Middle Devonian
    Dl;0Dl = Lower Devonian
    S;0S = Silurian
    Om;0Om = Maquoketa
    Og;0Og = Galena-Platteville
    Oa;0Oa = Ancell
    Op;0Op = Prairie du Chien
    CA;0CA = Cambrian
    water;0water
    unit_link
    composite map label = ST + sgmc_label This creates a unique identifier for every unit in the CONUS (continental United States) covers.

    type: character width: 18 output width: 18 (Source: Doug Stoeser)
    ValueDefinition
    ILT;0T = Tertiary
    ILK;0K = Cretaceous
    ILPAma;0PAma = Mattoon Formation
    ILPAb;0PAb = Bond Formation
    ILPAm;0PAm = Modesto Formation
    ILPAc;0PAc = Carbondale Formation
    ILPAs;0PAs = Spoon Formation
    ILPAa;0PAa = Abbott Formation
    ILPAcv;0PAcv = Caseyville Formation
    ILMcu;0Mcu = Upper Chesterian (Grove Church - Tar Springs)
    ILMcl;0Mcl = Lower Chesterian (Glen Dean - Renault)
    ILMvu;0Mvu = Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis)
    ILMvm;0Mvm = Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east)
    ILMvl;0Mvl = Lower Valmeyeran (Keokuk-Sedalia)
    ILMk;0Mk = Kinderhookian
    ILDu;0Du = Upper Devonian
    ILDm;0Dm = Middle Devonian
    ILDl;0Dl = Lower Devonian
    ILS;0S = Silurian
    ILOm;0Om = Maquoketa
    ILOg;0Og = Galena-Platteville
    ILOa;0Oa = Ancell
    ILOp;0Op = Prairie du Chien
    ILCA;0CA = Cambrian
    ILwater;0water
    source
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser)
    ValueDefinition
    IL001Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
    unit_age
    The geologic age from the source map used.

    type: character width: 60 output width: 60

    (Source: Doug Stoeser)
    ValueDefinition
    Cambrian 
    Cretaceous 
    Devonian 
    Mississippian 
    Ordovician 
    Pennsylvanian 
    Silurian 
    Tertiary 
    rocktype1
    The predominant lithology found in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1)
    ValueDefinition
    black shale 
    dolostone (dolomite) 
    limestone 
    sand 
    sandstone 
    shale 
    water 
    rocktype2
    The second most predominant lithology in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1)
    ValueDefinition
    chert 
    clay or mud 
    dolostone (dolomite) 
    limestone 
    sandstone 
    shale 
    siltstone 
    il_geol.aat
    Arc attribute table for Illinois geologic coverage. (Source: ESRI)
    arc-code
    Unique identifier for the line feature

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    1contact, location certain
    7shoreline or riverbank
    30fault, sense of displacement unknown or undefined, location certain
    124state boundary
    arc-para1
    Used for "decorated" lines where additional information is needed.

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    arc-para2
    "Scratch" field used mostly in Alaska.

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    source
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser)
    ValueDefinition
    IL001Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
    US001Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationMW.pdf)
    Entity_and_Attribute_Overview:
    Coding for polygon attributes:

    NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province unit_link sgmc_label and a state code identifier source reference to source of data unit_age geologic age rocktype1 dominant lithology rocktype2 second most dominant lithology

    Coding for arc attributes:

    NAME: FEATURE: arc-code unique integer identifier arc-para1 used where additional information is needed arc-para2 scratch field source reference to source of data

    Coding for point attributes:

    NAME: FEATURE: point_feature name of feature on map source reference to source of data

    Coding for dikes (special arcs) attributes:

    NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province arc-code unique integer identifier dike_lith general lithology dike_age geologic age source reference to source of data

    Entity_and_Attribute_Detail_Citation: ESRI

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Suzanne W. Nicholson
    • Connie L. Dicken
    • Michael P. Foose
    • Julia Mueller
  2. Who also contributed to the data set?
    State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis projects of the US Geological Survey Mineral Resources Program.

  3. To whom should users address questions about the data?
    Suzanne W. Nicholson
    U.S. Geological Survey
    12201 Sunrise Valley Dr. MS954
    Reston, VA
    USA

    703-648-6344 (voice)
    swnich@usgs.gov

Why was the data set created?

A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in CONUSdocumentationMW.pdf of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries.

How was the data set created?

  1. From what previous works were the data drawn?
    IL002 (source 1 of 4)
    Illinois State Geological Survey, 1996, Bedrock Geology of Illinois: ISGS GIS Database bedgeo, Illinois State Geological Survey, Champaign, Illinois.

    Type_of_Source_Media: digital map
    Source_Scale_Denominator: 500,000
    Source_Contribution: Provided linework for geology coverage.
    IL001 (source 2 of 4)
    Willman, H.B, Frye, J.C., Simon, J.A., Clegg, K.E., Swann, D.H., Atherton, E., Collinson, C., Lineback, J., and Buschbach, T.C., 1967, Geologic Map of Illinois: ISGS map Geologic Map of Illinois, Williams and Heintz Map Corp., Capitol Heights, MD.

    Type_of_Source_Media: mylar map
    Source_Scale_Denominator: 500,000
    Source_Contribution: provided unit descriptions
    US001 (source 3 of 4)
    Johnson, Bruce R., and Leveritch, Beth, unpublished material, 1:100,000 Scale State Boundaries of the Conterminous United States.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 100,000
    Source_Contribution: Provided linework for state boundaries
    Johnson Lith Class 6.1 (source 4 of 4)
    Johnson, Bruce R., unpublished material, Geologic Map Unit Classification, ver. 6.1.

    Type_of_Source_Media: online; http://geology.usgs.gov/dm
    Source_Scale_Denominator: none
    Source_Contribution: Classification scheme used for lithology.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 10)
    The purpose of this standardization is to allow all SGMC covers to be seamlessly joined without any additional effort to form regional or national level digital maps. Note that for Alaska, the state is being compiled as blocks of 1:250k quadrangles that will ultimately be used to compile a new state map. Douglas Stoeser (USGS) and Ric Wilson (USGS) are co-coordinators for the overall SGMC effort, with Stoeser coordinating work on the mainland states and Wilson coordinating work for Alaska and Hawaii.
    Date: 08-Dec-2003 (process 2 of 10)
    Downloaded the digital files from Illinois Natural Resources Geospatial Data Clearinghouse website at http://www.isgs.uiuc.edu/nsdihome/

    Imported bedgeo.e00 into a coverage and reprojected the data into the following:

    projection: Lambert Conformal Conic units: meters datum: NAD27 standard parallel 1: 33 0 0.000 standard parallel 2: 45 0 0.000 central meridian: -100 0 0.000 reference latitude: 0 0 0.000 false easting: 0.00000 false northing: 0.00000

    No extraneous attributes were in the table, therefore no attributes were deleted. (Note: Attributes associated with the generation of the coverages were not deleted. PAT - shape, area, perimeter, coverage#, and coverage-id AAT - shape, fnode#, tnode#, lnode#, rnode#, length, coverage#, and coverage-id)

    The only attribute in the table is bed-geo.

    The values from bed-geo were calculated into a new field called orig_label.
    Date: 15-Mar-2004 (process 3 of 10)
    The relevant state outline (arcs) was removed from the coverage and replaced with the arcs from the 1:100,000 Scale State Boundaries of the Conterminous United States.

    This allows for a seamless fit of each state to a standard state boundary base.
    Date: 16-Mar-2004 (process 4 of 10)
    In order to prepare a uniform .pat file, the following attributes were exported from our standardized database for Illinois as a .dbf:

    orig_label, map_symbol2, unit_link, reference_id, unit_age, rocktype1, and rocktype2.

    orig_label reflects the original map symbol used on the source map

    map_symbol2 reflects map-symbol1 with the addition of a province number

    unit_link is an auto generated field based on map-symbol2 and the state abbreviation (e.g. IL001) that produces a unique identifier for each map unit

    reference_id was populated with an alphanumeric code (e.g. US001) that designates the source used for the linework and other references used to describe the age or lithologies of the unit.

    unit_age was populated with general age assignment

    rocktype1 records dominant lithology (must be >50% of unit), using standardized data dictionary

    rocktype2 records second most dominant lithology, using standardized data dictionary

    orig_label has the following field names from the source map:

    bed-geo in Illinois map_code in Indiana symbol in Michigan symbol in Wisconsin map_label in Minnesota

    The attributes were then converted using the following structure:

    item name: orig_label width: 12 output: 12 type: c

    item name: sgmc_label width: 16 output: 16 type: c

    item name: unit_link width: 18 output: 18 type: c

    item name: source width: 6 output: 8 type: c

    item name: unit_age width: 60 output: 60 type: c

    item name: rocktype1 width: 40 output: 40 type: c

    item name: rocktype2 width: 40 output: 40 type: c
    Date: 16-Mar-2004 (process 5 of 10)
    Once the .dbf was in the correct format with standardized column widths and data structure, it was converted into a lookup table (.lut) in Arc/Info. Then a joinitem was performed to join the look-up table to the polygon attribute table (.pat). orig_label was used as the merge item.
    Date: 25-Mar-2004 (process 6 of 10)
    Next, in preparing the uniform arc attribute table (.aat), the following items were added to the table:

    item name: arc-code width: 3 output: 3 type: i

    item name: arc-para1 width: 3 output: 3 type: i

    item name: arc-para2 width: 3 output: 3 type: i

    item name: source width: 6 output: 8 type: c
    Date: 25-Mar-2004 (process 7 of 10)
    Arc-code was populated using the paper map source to tag the lines using the AAT line type data dictionary (see CONUSdocumentationMW.pdf).

    Arc-para1 was populated when additional information was available such as identifying the upthrown side of a fault or direction of thrusting on a fault. (see CONUSdocumentationMW.pdf)

    Arc-para2 is a scratch field that is used mostly in Alaska.

    Source was populated with an alphanumeric code (e.g. US001) that designates the source used for the linework.

    Date: 25-Mar-2004 (process 8 of 10)
    Once the .aat and the .pat were populated with the correct attributes, the coverage was exported as an .e00 file (ILgeol_lcc.e00).

    Then it was unprojected into geographic coordinates and exported again (ILgeol_dd.e00).
    Date: 26-Mar-2004 (process 9 of 10)
    The faults were extracted to generate a separate fault file. PUT was the command used to copy the line features from the geology line coverage into a new fault line coverage.

    The data were exported as an .e00 file (ILfaults_lcc.e00) and then unprojected into geographic coordinates and exported again (ILfaults_dd.e00).
    Date: 26-Mar-2004 (process 10 of 10)
    Finally, the geology lines, geology polygons and fault line coverages were converted into shapefiles; in both geographic coordinates and in Lambert Conformal Conic projection.
  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?
    The values of the attributes ROCKTYPE1 and ROCKTYPE2 were assigned based on the information in the legends of the source maps (most of which are paper). The definitions of these values are described in the draft document Geologic Map Classification version 6.1 (Johnson and others); available at the following website: http://geology.usgs.gov/dm
  2. How accurate are the geographic locations?
    Accuracy of Illinois state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1:100000 scale original data used to produce this boundary. (Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationMW.pdf))

    Those internal arcs intersecting the state boundary were extended or shortened as needed to complete polygons, possibly creating a small amount of error.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Bodies of water are classified as water, and the geologic units underlying them are not included in this coverage.
  5. How consistent are the relationships among the observations, including topology?
    All internal polygons were checked for closure with vendor software and on hard copy plots. Overshoots and undershoots have been deleted or corrected as appropriate.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
This database is not meant to be used or displayed at any scale other than 1:500,000.

Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.

  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey Information Services Reston-ESIC
    U.S. Geological Survey
    507 National Center
    Reston, Virginia
    USA

    1-888-ASK-USGS or 1-703-648-5953 (voice)
  2. What's the catalog number I need to order this data set? USGS OFR 2004-1355
  3. What legal disclaimers am I supposed to read?
    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: Geologic units and structural features in format ARC/INFO export (version 8.3)
      Network links: http://pubs.usgs.gov/of/2004/1355/
    • Cost to order the data: none

Who wrote the metadata?

Dates:
Last modified: 18-May-2004
Metadata author:
U.S. Geological Survey
Attn: Connie L. Dicken
12201 Sunrise Valley Dr. MS954
Reston, VA
USA

703-648-6482 (voice)
cdicken@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://mrdata.usgs.gov/geology/state/metadata/il.faq.html>
Generated by mp version 2.9.50 on Mon Jan 27 16:07:32 2020