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 Texas

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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 Texas
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 Texas: 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: -105.833
    East_Bounding_Coordinate: -93.5
    North_Bounding_Coordinate: 36.666
    South_Bounding_Coordinate: 25.75
  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 Texas geologic coverage. (Source: ESRI)
    unmodified map unit symbol from source cover. (Source: Doug Stoeser)
    HFsfill and spoil
    QacAlluvium in Rio Grande, subdivided into areas predominantly of clay
    Qafalkali flat deposits
    Qaoolder alluvial deposits
    QasAlluvium in Rio Grande, subdivided into areas predominantly of sand
    Qbbolson deposits
    Qbbbarrier island deposits
    QbcBeaumont Formation, areas predominantly clay
    QbdBlackwater Draw Formation
    Qbrbarrier ridge and barrier flat deposts
    QbsBeaumont Formation, areas predominantly sand
    Qbvclay veneer over meanderbelt sand
    Qccaliche deposits
    Qcdclay dune
    QdDeweyville Formation
    Qd?Deweyville Formation with higher level?
    QdlDouble Lakes Formation
    Qdsdune sand sheet deposits
    Qfalluvial fan deposits
    QgGatuna Formation
    Qgygypsite deposits
    Qhghigh gravel deposits
    QlLissie Formation
    QleLeona Formation
    QliLingos Formation
    Qlsland slide deposits
    QoOnion Creek Marl
    Qpplaya deposits
    Qssand sheet deposits
    Qsdsand dune deposits
    QseSeymour Formation
    Qsisilt sheet
    Qsusand deposits, undivided
    QtTerrace deposits
    QtaTahoka Formation
    QtlToy Limestone
    QtuTule Formation
    QuQuaternary deposit, undivided
    Qunpond deposits
    QTQuaternary-Tertiary deposits, undivided
    QTbQuaternary-Tertiary bolson deposits
    QTuUvalde Gravel
    TiTertiary intrusive rocks, undivided
    PObBlanco Formation
    PObobolson deposits
    POfFingers Formation
    POrRita Blanca Formation
    POuunnamed Pliocene deposits
    POwWillis Formation
    POMIoOgallala Formation
    MIbBlack Gap area volcanic rocks
    MIdDelaho Formation and unit 9 of Rawls Formation
    MIfFleming Formation
    MIfoFleming Formation and Oakville Sandstone, undivided
    MIgGoliad Formation
    MIiMiocene intrusive rocks
    MIoOakville Sandstone
    MItTarantula Gravel
    MIOGDelaho and Rawls Formations, undivided
    OGcCatahoula Formation
    OGcfCatahoula Formation and Frio Clay, undivided
    OGcmChinati Mountains caldera volcanic rocks, including Chinati Mountains Group, Mitchell Mesa Ignimbrite, and type area of Petan Basalt
    OGdyounger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formation
    OGdeDuff Formation, Decie Member from Paisano caldera
    OGeEagle Mountains caldera volcanic rocks
    OGfFrio Clay
    OGiOligocene intrusive rocks
    OGjJones Basalt
    OGmrTm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area)
    OGnNash Creek Formation
    OGpfPerdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation
    OGqQuitman Mountains caldera volcanic rocks and volcanic rocks of sneed (Cox) Mountain and west of Victorio Peak
    OGrBofecillos volcano volcanic rocks, including units 1-8 of Rawls Formation and lava flows in upper part of Fresno Formation
    OGsSouth Rim Formation from Pine Canyon Caldera
    OGsaSantana Tuff from Sierra Rica caldera in Mexico
    OGscSan Carlos Tuff from San Carlos caldera in Mexico
    OGshupper part of Shely Group, including Tm4 or Morita Ranch Formation
    OGEOcChisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of the Tornillo Formation, undivided
    OGEOdDuff Formation (with Decie Member from Paisano caldera shown separately), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided
    OGEOgDevils Graveyard volcanic rocks
    OGEOjJackson Group, undivided
    OGEOvVieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia
    OGEOwWhitsett Formation
    EOqcQueen City Sand
    EOrReklaw Formation
    EOsSparta Sand
    EOvEocene volcanic rocks
    EOvhVan Horn Mountains caldera volcanic rocks
    EOwWeches Formation
    EOwbWellborn Formation
    EOwmWiley Mountain caldera volcanic rocks
    EOyYegua Formation
    EOyaYazoo Formation
    EObBigford Formation
    EOcCarizzo Sand
    EOcaCadell Formation
    EOcmCook Mountain Formation
    EOdolder volcanic rocks of Davis and Barilla Mountains, including Sheep Pasture, Sleeping Lion, Frazier Canyon, Adobe Canyon, and Limpia formations, Gomez Tuff, Star Mountain Rhyolite, and Huelster Formation
    EOepEl Pico Clay
    EOhhHannold Hill Member of Tornillo Formation
    EOiEocene intrusive rocks
    EOinInfiernito caldera volcanic rocks including Capote Mountain Tuff, Tsh2 of Shely Group, Buckshot Ignimbrite, and Tm1 of Morita Ranch Formation
    EOjlManning, Wellborn, and Cadell Formations, undivided
    EOlLaredo Formation
    EOmManning Formation
    EOmbMoodys Branch Formation
    EOPNcCalvert Bluff Formation
    EOPNinIndio Formation
    EOPNuReklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided
    EOPNwiWilcox Group, undivided
    PNbpBlack Peaks Member of Tornillo Formation
    PNhHooper Formation
    PNkKincaid Formation
    PNkjJavelina Member of Tornillo Formation
    PNmiMidway Group, undivided
    PNsSimsboro Formation
    PNwWills Point Formation
    KCretaceous rocks, undivided
    KaAntlers Sand
    KacAnacacho Limestone
    KagAguja Formation
    KanAnnona Chalk
    KauAustin Chalk
    KbBenevides Formation
    KbbBuda Limestone and San Martine Member of Borache Limestone, undivided
    KbdBuda Limestone and Del Rio Clay, undivided
    KbeBuda Limestone and Eagle Mountain Sandstone, undivided
    KbfBenevides Formation and Finlay Limestone, undivided
    KbhBoracho Limestone
    KbiBissett Conglomerate
    KblBlossom Sand
    KbmBluff Mesa Formation
    KbnBonham Formation
    KboBouquillas Formation
    KbrBrownstown Marl
    KbuBuda Limestone
    KcComanchean rocks, undivided
    KcaComanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided
    KcgCampagrande Formation
    KcpComanche Peak Limestone
    KcsCow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided
    KcwComanche Peak Limestone and Walnut Clay, undivided
    KcxCox Sandstone
    KdaDakota Formation
    KdcDuck Creek Limestone
    KdgDel Rio Clay and Georgetown Limestone, undivided
    KdkDuck Creek Limestone and Kiamichi Formation, undivided
    KdmDel Carmen Limestone
    KdpDakota and Purgatoir Formations, undivided
    KdrDel Rio Clay
    KdvDevils River Limestone
    KeaEdwards Limestone and Antlers Sand, undivided
    KebEagle Ford Formation and Buda Limestone, undivided
    KecEdwards and Comanche Peak Limestones, undivided
    KedEdwards Limestone
    KefEagle Ford Formation
    KemFredericksberg Group and Maxon Sandstone, undivided
    KerEctor Chalk
    KesEscondido Formation
    KetEtholen Conglomerate
    KewEagle Ford Formation and Woodbine Formations, undivided
    KeyEspy Formation
    KfFinlay Limestone
    KfdFort Worth Limestone and Duck Creek Formation, undivided
    KfrFredericksburg Group
    Kfuundivided part Fredericksberg Group
    KgGulfian rocks, undivided
    KgcGober Chalk and Roxton Limestone
    KgmGrayson Marl and Main Street Limestone, undivided
    KgrGlen Rose Limestone
    KgtGeorgetown Limestone
    KgwGoodland Limestone and Walnut Clay, undivided
    KhHensell Sand
    KhfBoracho and Finlay Limestones, undivided
    Kiigneous rocks of Austin age
    KkcKemp clay and Corsicana Marl, undivided
    KkeKemp clay
    KkiKiamichi Formation
    KlpLoma Plata Formation
    KmbMarlbrook Marl
    KmkMcKnight Formation
    KnaNavarro Group, undivided
    KnbNavarro Group and Marlbrook Marl, undivided
    KneNeylandville Marl
    KnmNeylandville and Marlbrook Marls, undivided
    KnsNacatoch Sand
    KntNavarro and Taylor Groups, undivided
    KoOzan Formation
    KojOjinaga Formation
    KolOlmos Formation
    KpPen Formation
    KpaPaluxy Sand
    KpdPawpaw Formation, Weno Limestone, and Denton Clay, undivided
    KpgPecan Gap Chalk
    KpgrPaluxy Sand and Glen Rose Limestone, undivided
    KpiEl Picacho Formation
    KprPresidio Formation
    KptSue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
    KpwPawpaw Formation and upper limestone unit of Weno Formation, undivided
    KsaSalmon Peak Limestone
    KscSan Carlos Sandstone
    KseSanta Elena Limestone
    KshShafter Formation
    KsmSan Miguel Formation
    KstSanta Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
    KsuSue Peaks Formation
    KtMaxon Sandstone and Glen Rose Limestone, undivided
    KtbMaxon Sandstone and Bissett Conglomerate, undivided
    KtmTwin Mountains Formation
    KtoTorcer Formation
    KtpTravis Peak Formation
    Kuupper Cretaceous rocks, undivided
    KucUpson Clay
    KwWashita Group
    KwaWalnut Clay
    KwbWoodbine Formation
    KwcWolfe City Formation
    Kwfundivided parts of Washita and Fredericksberg Groups
    KwfrWashita and Fredericksburg Groups, undivided
    Kwllower part of Washita Group
    KwnWest Nueces Formation
    Kwuundivided part of Washita Group
    KyeYearwood Formation
    KyuYucca Formation
    JmMalone Formation
    JmoMorrison Formation
    TRcChinle Formation
    TRdDockum Group, undivided
    TRjTrujillo Formation
    TRvTecovas Formation
    PZalPaleozoic rocks, undivided
    PPermian rocks, undivided
    PaAlta Formation
    PacArcher City Formation
    PadAdmiral Formation
    PajAdmiral and Coleman Junction Formations, undivided
    PbBlaine Formation
    PbbBell Canyon, Cherry Canyon, and Brushy Canyon Formations undivided
    PbcBell Canyon Formation
    PbeBead Mountain Formation
    PbgBriggs Formation
    PbrBrushy Canyon Formation
    PbsBone Spring Formation
    PcCapitan Formation
    PcbCarlsbad Group
    PccCherry Canyon Formation
    PcfClear Fork Group
    PciCibolo Formation
    PcjColeman Junction Formation
    PclCloud Chief Formation
    PcmCathederal Mountain Formation
    PcoCutoff Formation
    PdDewey Lake Red beds
    PecElm Creek Formation
    PgcGrape Creek Formation
    PgsGoat Seep Formation
    PhHueco Limestone
    PjvJagger Bend and Valera Formations, undivided
    PlnLenox Hills and Neal Ranch Formations, undivided
    PluLueders Formation
    PmMunn Formation
    PmgMina Grande Formation
    PmoMoran Formation
    PnNocona Formation
    PpPetrolia Formation
    PpcPinto Canyon Formation
    PpuPueblo Formation
    PqQuartermaster Formation
    PqwQuartermaster Formation and Whitehorse Group, undivided
    PrRoss Mine Formation
    Prcgypsum of Rustler, Salado, and Castile Formations, undivided
    PruRustler Formation
    PsaSan Angelo Formation
    PsbSanta Anna Branch Shale
    PscSalado and Castile Formations, undivided
    PseSedwick Formation
    PshSkinner Ranch and Hess Formations, undivided
    PsmSedwick and Moran Formations, undivided
    PsrSeven Rivers Formation
    PssSanta Anna Branch Shale and Sedwick and Moran Formations, undivided
    PtTansill Formation
    PtaTalpa Formation
    PtsTessey Limestone
    PvcVictorio Peak Formation
    PwWord Formation
    PwbWhitehorse Group and Blaine Formation, undivided
    PwhWhitehorse Group, undivided
    PwiWilke Ranch Formation
    PwrWaggoner Ranch Formation
    PyYates Formation
    PPAhHarpersville Formation
    PPAmMagdalena Formation
    PPAmaMarkley Formation
    PAbrBrazos River Formation
    PAcaCedarton Shale and Adams Branch Limestone, undivided
    PAciCienequita Formation
    PAcrChico Ridge Limestone
    PAdDimple Formation
    PAgrGrindstone Creek Formation, expanded
    PAgtGaptank Formation
    PAhHaymond Formation
    PAhcHome Creek Limestone and Colony Creek Shale, undivided
    PAjcJasper Creek Formation
    PAlbLazy Bend Formation
    PAmMingus Formation
    PAmfMarble Falls Limestone
    PApbpre-Brazos River rocks, undivided
    PApmPalo Pinto and Mineral Wells Formations, undivided
    PAppPalo Pinto Formation
    PArRanger Limestone
    PArpRanger Limestone and Placid Creek Shale, undivided
    PAstStrawn Group
    PAswSmithwick Formation
    PAtgThrifty and Graham Formations, undivided
    PAuunnamed Pennsylvanian rocks
    PAvVentioner Formation
    PAwWinchell Limestone
    PAwmWolf Mountain Shale
    PAwpWillow Point Formation
    PAMtTesnus Formation
    MDBarnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided
    MDcCaballos Novaculite and Maravillas Chert, undivided
    MDhHelms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided
    MDOMississippi, Devonian, and Ordovician rocks, undivided
    SfFusselman Dolomite
    SsStarke Limestone
    OOrdovician rocks, undivided
    ObBurnam Limestone
    OgGorman Formation
    OhHoneycut Formation
    OmMontoya Dolomite
    OtTanyard Formation
    OCAWoods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided
    OCAeEl Paso Formation and Bliss Sandstone, undivided
    CAhHickory Sandstone Member
    CAlcRiley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided
    CApwWilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided
    CAsWilberns Formation showing San Saba Member
    pCAaAllamore Formation
    pCAbBig Branch Gneiss
    pCAcCoal Creek Serpentinite
    pCAhHazel Formation
    pCAiCarrizo Mountain Group showing metaigneous rocks
    pCAlLost Creek Gneiss
    pCAlaLlanoria Quartzite
    pCAmMafic igneous rocks
    pCAmcMundy Breccia and Castner Limestone, undivided
    pCApPacksaddle Schist
    pCArRed Mountain Gneiss
    pCAsarrizo Mountain Group showing metasedimentary rocks
    pCAtTown Mountain Granite
    pCAvValley Spring Gneiss
    pCAvhVan Horn Sandstone
    pCAyYounger granitic intrusion
    sgmc_label = orig_label + ;n where n= province number (n=0 if no province) (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
    Holocenegeologic age
    Middle (?) Pleistocene to Recentgeologic age
    Pleistocene and Holocenegeologic age
    Pleistocenegeologic age
    Middle Pleistocenegeologic age
    Middle (?) Pleistocenegeologic age
    Early (?) Pleistocenegeologic age
    Tertiarygeologic age
    Pliocene to Pleistocenegeologic age
    Pliocenegeologic age
    Pliocene to Miocenegeologic age
    Miocenegeologic age
    Miocene to Oligocenegeologic age
    Oligocenegeologic age
    Oligocene and Eocenegeologic age
    Eocene to Oligocenegeologic age
    Late Eocene to Early Oligocenegeologic age
    Early Oligocenegeologic age
    Eocenegeologic age
    Late Eocenegeologic age
    Middle Eocenegeologic age
    Paleocenegeologic age
    Paleocene and Eocenegeologic age
    Paleocene to Eocenegeologic age
    Late Cretaceousgeologic age
    Early and Late Cretaceousgeologic age
    Early Late Cretaceous and Late Early Cretaceousgeologic age
    Early Cretaceousgeologic age
    Late Jurassicgeologic age
    Late Triassicgeologic age
    Paleozoicgeologic age
    Permiangeologic age
    Pennsylvanian to Permian?geologic age
    Pennsylvaniangeologic age
    Late Pennsylvaniangeologic age
    Middle Pennsylvaniangeologic age
    Early, Middle, and Late Pennsylvaniangeologic age
    Early Pennsylvaniangeologic age
    Early Pennsylvanian and Late Mississippiangeologic age
    Mississippi, Devonian, and Ordoviciangeologic age
    Late Ordovician, Mississippian, and Devoniangeologic age
    Mississippian and Devoniangeologic age
    Late Mississippian and Devoniangeologic age
    Middle Siluriangeologic age
    Early and Middle Siluriangeologic age
    Ordoviciangeologic age
    Late Ordoviciangeologic age
    Middle and Late Ordoviciangeologic age
    Early Ordoviciangeologic age
    Cambrian and Ordoviciangeologic age
    Late Cambrian? to Early Ordoviciangeologic age
    Late Cambriangeologic age
    Middle Cambriangeologic age
    preCambrian (Proterozoic)geologic age
    preCambrian (Proterozoic), Grenville Seriesgeologic age
    The predominant lithology found in the formation. (Source: unit classification)
    alluvial fan 
    mixed clastic/carbonate 
    fine-grained mixed clastic 
    medium-grained mixed clastic 
    coarse-grained mixed clastic 
    ash-flow tuff 
    amphibole schist 
    The second most predominant lithology in the formation. (Source: unit classification)
    fine-grained mixed clastic 
    medium-grained mixed clastic 
    mixed clastic/carbonate 
    ash-flow tuff 
    mica schist 
    Arc attribute table for Texas geologic coverage. (Source: ESRI)
    Unique identifier for the line feature (Source: AAT data dictionary, Appendix H)
    1contact, location certain
    7shoreline or riverbank
    8internal contact; no symbol drawn
    124state boundary
    125international 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?
    Stoeser and others (2004) (source 1 of 4)
    Stoeser, Douglas B., Shock, Nancy, Green, Gregory N., Dumonceaux, Gayle M., and Heran, William D., A Digital Geologic Map Database for the State of Texas: Data Series DS, U.S. Geological Survey, Denver, Colorado.

    Type_of_Source_Media: on line
    Source_Scale_Denominator: 5000000
    Source_Contribution: digital compilation
    TX001 (source 2 of 4)
    Virgil E.Barnes, compiler, 1992, Geologic Map of Texas: State Maps SM0003, Bureau of Economic Geology, The University of Texas at Austin, Texas, Austin, Texas.

    Type_of_Source_Media: digital
    Source_Scale_Denominator: 500000
    Source_Contribution: Original compilation
    US001 (source 3 of 4)
    Johnson, Bruce R., 1:100,000 Scale State Boundaries of the Conterminous United States.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 100000
    Source_Contribution: Provided linework for state boundaries
    Johnson Lith Class 6.1 (source 4 of 4)
    Johnson, Bruce R., Geologic Map Unit Classification, ver. 6.1.

    Type_of_Source_Media: digital data
    Source_Contribution: Classification scheme used for lithology.
  2. How were the data generated, processed, and modified?
    Date: 2004 (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: 2005 (process 2 of 6)
    G.N. Green obtained the digital geologic map of Texas from the website:

    these arc/info coverages werer projected 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 ORIG_LABEL.

    (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)

    Date: 2004 (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: Mar-2005 (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: 2005 (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: Mar-2005 (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 Texas 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 Data Series 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: 29-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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