Preliminary Integrated Geologic Map Databases for the United States Central States: Montana, Wyoming, Colorado, New Mexico, Kansas, Oklahoma, Texas, Missouri, Arkansas, and Louisiana, - The State of Colorado

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Frequently anticipated questions:

What does this data set describe?

Preliminary Integrated Geologic Map Databases for the United States Central States: Montana, Wyoming, Colorado, New Mexico, Kansas, Oklahoma, Texas, Missouri, Arkansas, and Louisiana, - The State of Colorado
This open-file report presents the 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 geo- environmental 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 Chapter A, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii.
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?
    Stoeser, Douglas B., Green, Gregory N., Morath, Laurie C., Heran, William D., Wilson, Anna B., Moore, David W., and Bradley S. Van Gosen, 2005, Preliminary Integrated Geologic Map Databases for the United States Central States: Montana, Wyoming, Colorado, New Mexico, Kansas, Oklahoma, Texas, Missouri, Arkansas, and Louisiana, - The State of Colorado: U.S. Geological Survey Open-File Report 2005-1351, U.S. Geological Survey, Denver, CO.

    Online Links:

    This is part of the following larger work.

    Stoeser, Douglas B., Green, Gregory N., Morath, Laurie C., Heran, William D., Wilson, Anna B., Moore, David W., and Bradley S. Van Gosen, 2005, Preliminary Integrated Geologic Map Databases for the United States Central States: Montana, Wyoming, Colorado, New Mexico, Kansas, Oklahoma, Texas, Missouri, Arkansas, and Louisiana.: U.S. Geological Survey Open-File Report 1351, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -109.25
    East_Bounding_Coordinate: -102.00
    North_Bounding_Coordinate: 41.00
    South_Bounding_Coordinate: 37.00
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2005
    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?
    Polygon attribute table for the Colorado geologic coverage. (Source: ESRI)
    unmodified map unit symbol from source cover. (Source: Doug Stoeser)
    QaModern alluvium
    QgGravels and alluviums
    QgoOlder gravels and alluviums
    QeEolian deposits
    QeoOlder eolian deposits
    QdGlacial drift
    QdoOlder glacial drift
    QlLandslide deposits
    QbBasalt flows
    QTSaUnclassified surficial deposits and underlying Alamosa Fm in San Luis Valley
    QTaAncient alluvium
    ToOgallala Fm
    TgvBouldery gravel on old erosion surfaces in Front Range and Never Summer Mountains
    TaArikaree Fm
    TwrWhite River Fm or Group
    ThHuerfano Fm
    TcuCuchara Fm
    TpcPoison Canyon Fm
    TduUpper part of Dawson Arkose
    TbpBrowns Park Fm
    TtTroublesome Fm
    TnpNorth Park Fm
    TosOligocene sedimentary rocks
    TuUinta Fm
    TbBridger Fm
    TgGreen River Fm
    TgpGreen River Fm--Parachute Creek Member
    TglGreen River Fm--Lower Part
    TglmGreen River Fm--Laney Member
    TgtGreen River Fm--Tipton Tongue
    TgluGreen River Fm--Luman Tongue
    TglwLower part of Green River Fm and Wasatch Fm
    TwWasatch Fm
    TwcWasatch Fm--Cathedral Bluffs Tongue
    TwnWasatch Fm--Niland Tongue
    TwoWasatch Fm (including Fort Union equivalent at base) and Ohio Creek Fm
    TfFort Union Fm
    TcCoalmont Fm
    TmMiddle Park Fm exclusive of Windy Gap Member
    TdDry Union Fm
    TsSante Fe Fm
    TspSouth Park Fm
    TlpLos Pinos Fm
    TsjSan Jose Fm
    TeEocene prevolcanic sedimentary rocks
    TnNacimiento Fm
    TbbBasalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite
    TbbiBasaltic intrusive rocks related to basalt flows
    TbrRhyolitic intrusive rocks and flows of late-volcanic bimodal suite
    TbrtAsh-flow tuff of late-volcanic bimodal suite
    TafAsh-flow tuff of main volcanic sequence
    TialIntra-ash flow andesitic lavas
    TiqlIntra-ash flow quartz latitic lavas
    TplPre-ash-flow andesitic lavas, breccias, tuffs, and conglomerates
    TwmWall Mountain Tuff
    TvVolcanic rocks in northwestern Colorado
    TuiUpper Tertiary intrusive rocks
    TmiMiddle Tertiary intrusive rocks
    TdvBasaltic flows in Denver Fm near Golden
    TKdaDenver and Arapahoe Fms
    TKdlDenver Fm or lower part of Dawson Arkose
    TKrRaton Fm
    TKaAnimas Fm
    TKecTelluride conglomerate of Eocene prevolcanic sedimentary rocks (Te) and Cimarron Ridge Fm
    TKiLaramide intrusive rocks
    KlLaramie Fm
    KfFox Hills Sandstone
    KlfLaramie Fm and Fox Hills Sandstone
    KvtVermejo Fm and Trinidad Sandstone
    KpPierre Shale, undivided
    KpuPierre Shale--Upper unit
    KpmPierre Shale--Middle unit
    KplPierre Shale--Lower unit
    KnNiobrara Fm Transitional unit between Battle Spring and Wasatch Formations
    KcgCarlile Shale, Greenhorn Limestone, and Graneros Shale
    KcColorado Group
    KpgPierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided
    KdpDakota Sandstone and Purgatoire Fm
    KdDakota Sandstone or Group
    KlnLance Fm
    KmwWindy Gap Member of Middle Park Fm
    KlsLewis Shale
    KmvMesaverde Fm, undivided
    KmvuMesaverde Group or Fm--Upper part
    KmvlMesaverde Group or Fm--Lower part
    KwWilliams Fork Fm
    KiIles Fm
    KhHunter Canyon Fm
    KscSego Sandstone, Buck Tongue of Mancos Shale, and Castlegate Sandstone
    KmgsMount Garfield Fm and Sego Sandstone
    KmMancos Shale
    KmfmMancos Shale--Frontier Sandstone and Mowry Shale Members
    KfdFrontier Sandstone and Mowry Shale Members of Mancos Shale, and Dakota Sandstone
    KdbDakota Sandstone and Burro Canyon Fm
    KkfKirtland Shale and Fruitland Fm
    KpclPictured Cliffs Sandstone and Lewis Shale
    KchCliff House Sandstone
    KmpMenefee Fm and Point Lookout Sandstone
    KmjMancos Shale--Juana Lopez Member
    KJdmDakota and Morrison Fms
    KJdjDakota, Burro Canyon, Morrison, and Junction Creek Fms
    KJdwDakota, Burro Canyon, Morrison, and Wanakah Fms
    KJdrDakota Group and Morrison And Ralston Creek Fms at mountain front between Boulder and Colorado Springs. Dakota, Purgatoire, Morrison, and Ralston Creek Fms in Canon City area
    KJdeDakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada Fms in northwest
    KJdsDakota, Morrison, and Sundance Fms
    JmMorrison Fm
    JmjMorrison Fm and Junction Creek Sandstone
    JmcMorrison Fm and Curtis Fm
    JmwMorrison Fm and Wanakah Fm (Junction Creek Sandstone Member at or near top; Pony Express Limestone Member at base)
    JmrMorrison and Ralston Creek Fms
    JmeMorrison Fm and Entrada Sandstone
    JmsMorrison Fm and Sundance Fm
    JmseMorrison Fm, Summerville Fm, and Entrada Sandstone
    JmceMorrison, Curtis, and Entrada Fms
    JmreMorrison, Ralston Creek, and Entrada (or Exeter) Fms
    JmweMorrison, Wanakah, and Entrada Fms
    JTRgGlen Canyon Sandstone
    JTRgcGlen Canyon Group and Chinle Fm
    JTRmgMorrison, Curtis, Entrada, and Glen Canyon Fms
    JTRmcMorrison, Entrada, and Chinle Fms
    TRkcKayenta Fm, Wingate Sandstone, and Chinle Fm
    TRwcWingate Sandstone and Chinle Fm
    TRmMoenkopi Fm
    TRchChugwater Fm
    TRccChinle and Chugwater Fms
    TRcChinle Fm
    TRdDolores Fm
    TRdgDockum Group
    TRPlLykins Fm
    TRPsState Bridge Fm
    TRPllLykins Fm and Lyons Sandstone
    TRPjsJelm, Lykins, Lyons, and Satanka Fms
    TRPcsChinle And State Bridge Fms
    TRPcpChinle, Moenkopi, and Park City Fms
    TRPrTriassic and Permian rocks
    TRPdcDolores Fm and Cutler Fm
    TRPmcMoenkopi Fm and Cutler Fm
    TRPAlfLykins Lyons and Fountain Fms
    PpPark City Fm
    PuUpper Permian rocks, undivided
    PcCutler Fm
    MZMesozoic rocks
    MZPZMesozoic and Paleozoic rocks
    PPAfFountain Fm
    PPAcfCasper Fm and Lower part of Fountain Fm
    PPAifIngleside Fm and Fountain Fm
    PPAsSangre de Cristo Fm
    PPAmMaroon Fm
    PPAwWeber Sandstone
    PPAwmWeber Sandstone and Maroon Fm
    PAmMinturn Fm and other units of Pennslyvanian age
    PAbBelden Fm
    PAmbMinturn and Belden Fms
    PAeEagle Valley Fm
    PAeeEagle Valley Fm - evaporitic facies
    PAmbeEvaporitic facies of Minturn And Belden Fms in South Park and southward
    PAhHermosa Fm
    PArhRico and Hermosa Fms
    PAmrMorgan Fm and Round Valley Limestone
    MCALeadville Limestone, Williams Canyon Limestone , Manitou Limestone, and Sawatch Quartzite
    MDOLeadville Limestone, Williams Canyon Limestone, and one or more of: Fremont Limestone, Harding Sandstone, and Manitou Limestone
    DOCAWilliams Canyon Limestone, Manitou Limestone, and Sawatch Quartzite
    OCAManitou Limestone and Sawatch Quartzite in Southern Front Range and Wet Mountains. One or more Ordovician Fms (Fremont Limestone, Harding Sandstone, and Manitou Dolomite), Dotsero Fm, Peerless Fm, and Sawatch Quartzite in west-central and south-central Colorado
    OrOne or more Ordovician fms
    MDLeadville Limestone, Gilman Sandstone, Dyer Dolomite, and Parting Fm
    MDCALeadville, Gilman, Dyer, Parting, and Sawatch Fms in west-central and south-central. Leadville Limestone, Ouray Limestone, Elbert Fm, and Ignacio Quartzite in far southwest.
    DOParting, Fremont, and Harding Fms
    CAsSawatch Quartzite
    MmMadison Limestone
    CAlLodore Fm
    MCAmlMadison Limestone and Lodore Fm
    CAamIntrusive rocks
    YuUinta Mountain Group
    YXuUncompahgre Fm
    XbBiotitic gneiss, schist, and migmatite
    XfhFelsic and hornblendic gneisses, either separate or interlayered
    XqQuartzite, conglomerate, and interlayered mica schist
    WrRed Creek Quartzite
    YpRocks of Pikes Peak Batholith (1000-m.y. age group)
    YgGranitic rocks of 1400-m.y. age group
    YamAlkalic and mafic rocks in small plutons, and diabase and gabbro dikes
    XgGranitic rocks of 1700-m.y. age group
    XmMafic rocks of 1700-m.y. age group
    YXgGranitic rocks of 1400- and 1700-m.y. age groups, undivided, or, in Taylor River region, rocks with characteristics of Xg but U-Th-Pb zircon ages of Yg
    sgmc_label = orig_label + ;n where n= province number (n=0 if no province number) (Source: Doug Stoeser)
    composite map label = ST + sgmc_label This creates a unique identifier for every unit in the CONUS (continental United States) covers. (Source: Doug Stoeser)
    reference to the source used (Source: Doug Stoeser)
    The geologic age from the source map used. (Source: Doug Stoeser)
    Quaternarygeologic age
    Tertiarygeologic age
    Pliocenegeologic age
    Miocenegeologic age
    Oligocenegeologic age
    Eocenegeologic age
    Paleocenegeologic age
    Mesozoicgeologic age
    Cretaceousgeologic age
    Jurassicgeologic age
    Triassicgeologic age
    Paleozoicgeologic age
    Permiangeologic age
    Pennsylvaniangeologic age
    Mississippiangeologic age
    Devoniangeologic age
    Ordoviciangeologic age
    Cambriangeologic age
    Middle Proterozoicgeologic age
    Early Proterozoicgeologic age
    Late Archaengeologic age
    The predominant lithology found in the formation. (Source: unit classification)
    dune sand 
    glacial drift 
    ash-flow tuff 
    mixed clastic/volcanic 
    felsic gneiss 
    biotite gneiss 
    quartz latite 
    The second most predominant lithology in the formation. (Source: unit classification)
    oil shale 
    volcanic breccia 
    mafic gneiss 
    Arc attribute table for Colorado geologic coverage. (Source: ESRI)
    Unique identifier for the line feature (Source: AAT data dictionary, Appendix H)
    1contact, location certain
    4normal fault, location certain
    7shoreline or riverbank
    18Internal contact
    52normal fault, concealed
    94Shear zone, certain
    101thrust fault, direction of motion undefined, location certain
    124state boundary
    Used for "decorated" lines where additional information is needed. (Source: AAT data dictionary)
    0no additional information
    1for normal faults, upthrown side is to the right
    "Scratch" field used mostly in Alaska. (Source: AAT data dictionary)
    0no additional information
    A coded reference citation indicating source material used. (Source: AAT data dictionary)
    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 predominant lithology rocktype2 second most predominant 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)
    • Douglas B. Stoeser
    • Gregory N. Green
    • Laurie C. Morath
    • William D. Heran
    • Anna B. Wilson
    • David W. Moore
    • Bradley S. Van Gosen
  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?
    Gregory N. Green
    U.S. Geological Survey
    MS 973, USGS, Denver Federal Center
    Denver, CO

    303-236-5390 (voice)

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 Chapter A 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?
    Tweto (1979) (source 1 of 4)
    Tweto, Ogden, 1979, Geologic map of Colorado.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 5000000
    Source_Contribution: Original mapping and compilation
    CO001 (source 2 of 4)
    Green, G.N., 1992, The Digital Geologic Map of Colorado in ARC/INFO Format.

    Type_of_Source_Media: digital map
    Source_Scale_Denominator: 500000
    Source_Contribution: Digital geologic map of Colorado
    US001 (source 3 of 4)
    Johnson, Bruce R., 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;
    Source_Contribution: Classification scheme used for lithology.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 6)
    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 and Ric Wilson 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: 15-Dec-2003 (process 2 of 6)
    G.N. Green obtained the digital geologic map of Colorado from the website:

    Re-projected the coverage 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: 0.000 false northing: 0.000

    All attributes were deleted except NAME.

    (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 values from NAME where then calculated into a new field called orig_label.
    Date: 22-Dec-2003 (process 3 of 6)
    The following attributes were exported from Filemaker as a comma delimited file

    map_symbol1 map_symbol2 unit_link reference_id unit_age rocktype1 rocktype2

    The attributes were then loaded into INFO with the following structures:

    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: 08-Sep-2010 (process 4 of 6)
    Once the .csv was loaded, it was joined in Arc/Info with the joinitem command. orig_label as the related item.
    Date: 02-Jan-2004 (process 5 of 6)
    Once the .pat file was correct, the .aat file was addressed. 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: 05-Jan-2004 (process 6 of 6)
    Arc-code was populated using the digital map source to tag the lines using the AAT line type data dictionary. Arc-para1 was populated when additional information was available such as upthrown side of a fault or angle of thrusting on a fault. Arc-para2 is a scratch field that is used mostly in Alaska. Source was populated with code that designates the source used for the linework; typically the paper map.
  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: )
  2. How accurate are the geographic locations?
    The geologic map was digitized from compilations ranging in scale from 1:1,000,000 to 1:100,000 and is an accurate representation of the source maps. It is intended to be used at scales ranging from 1:1,000,000 to 1:500,000. Display at significantly larger scales may produce small errors in locations of contacts or faults relative to features contained in other data sets. Accuracy of Colorado 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, Chapter A)) 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
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
    U.S. Geological Survey
    507 National Center
    Reston, Virginia

    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 2005-1351
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. 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:
    • Cost to order the data: none

Who wrote the metadata?

Last modified: 20-Oct-2004
Last Reviewed: 20-Oct-2004
Metadata author:
U.S. Geological Survey
Attn: Gregory N. Green
MS 973, USGS, Denver Federal Center
Denver, CO

1-303-236-5390 (voice)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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