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Integrated Geologic Map Databases for the United States: Alabama, Florida, Georgia, Mississippi, North Carolina, and South Carolina

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Title:
Integrated Geologic Map Databases for the United States: Alabama, Florida, Georgia, Mississippi, North Carolina, and South Carolina
Abstract:
This 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 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 Chapter A, 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?
    Dicken, Connie L., Nicholson, Suzanne W., Horton, John D., Foose, Michael P., and Mueller, Julia A.L., 2005, Integrated Geologic Map Databases for the United States: Alabama, Florida, Georgia, Mississippi, North Carolina, and South Carolina: U.S. Geological Survey Open-File Report 2005-1323, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.473123
    East_Bounding_Coordinate: -84.888537
    North_Bounding_Coordinate: 35.007782
    South_Bounding_Coordinate: 30.060675
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2005Currentness_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?
    al_geol.pat
    Polygon attribute table for the Alabama geologic coverage. (Source: ESRI)
    orig_label
    unmodified map unit symbol from source cover.

    type: character width: 12 output width: 12 (Source: Doug Stoeser)
    ValueDefinition
    atAlmond Trondhjemite
    baBeaverdam Amphibolite
    bmMylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    bsgBluff Springs Granite
    CbBibb Dolomite
    CbfBrierfield Dolomite
    CcConasauga Formation
    CchChilhowee Group undifferentiated
    CclConasauga Formation, lower unnamed shale facies
    CcnCochran Formation
    CcrCopper Ridge Dolomite
    CkKetona Dolomite
    CnNichols Formation
    CrRome Formation
    crMylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    CsShady Dolomite
    CwwrWeisner and Wilson Ridge Formations undifferentiated
    daDadeville Complex; Agricola Schist
    DcChattanooga Shale
    DcfmChattanooga Shale and Frog Mountain Sandstone undifferentiated
    dchDadeville Complex; Camp Hill Granite Gneiss
    DfmFrog Mountain Sandstone
    dmumDadeville Complex; Mafic and ultramafic rock
    drcDadeville Complex; Ropes Creek Amphibolite
    drmDadeville Complex; Rock Mills Granite Gneiss
    DtjcTalladega Group; Jemison Chert and Chulafinnee Schist undifferentiated
    DtjccTalladega Group; No name on map
    dwgnDadeville Complex; Waverly Gneiss
    dwsDadeville Complex; Waresville Schist
    egnElkahatchee Quartz Diorite Gneiss
    emEmuckfaw Group; Emuckfaw Group undifferentiated in part
    emgEmuckfaw Group; Glenloch Schist
    EOglClaiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part
    EOhWilcox Group; Hatchetigbee Formation
    EOjJackson Group undifferentiated
    EOlClaiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part
    EOtClaiborne Group; Tallahatta Formation
    HaltAlluvial, coastal and low terrace deposits
    hchHatchet Creek Group; Hanover Schist
    hcpHatchet Creek Group; Pinchoulee Gneiss
    hfHiggins Ferry Group
    hfgrHiggins Ferry Group; Roscoelite-graphite-quartz schist and graphitic quartzite
    hfgtHiggins Ferry Group; Garnet quartzite (garnetite) and garnitiferous altered mafic rock
    hgHissop Granite
    hgsHillabee Greenstone
    hgsfHillabee Greenstone, unnamed dacite unit
    hpHeflin Phyllite
    jgJacksons Gap Group; Jacksons Gap Group undifferentiated in part
    jgcJacksons Gap Group; Jacksons Gap Group, Unnamed unit
    jgtJacksons Gap Group; Tallassee Metaquartzite
    kaKetchepedrakee Amphibolite
    kbKahatchee Mountain Group; Brewer Phyllite
    kbsKahatchee Mountain Group; Sawyer Limestone Member of Brewer Phyllite
    KckTuscaloosa Group; Coker Formation
    KdSelma Group; Demopolis Chalk
    KeEutaw Formation
    KgTuscaloosa Group; Gordo Formation
    kgnKowaliga Gneiss
    KmSelma Group; Mooreville Chalk
    KpSelma Group; Providence Sand
    KpbSelma Group; Prairie Bluff Chalk
    KrSelma Group; Ripley Formation
    KRbSelma Group; Blufftown Formation
    KrcSelma Group; Cusseta Sand Member of the Ripley Formation
    kscKahatchee Mountain Group; Stumps Creek Formation
    KtTuscaloosa Group undifferentiated
    kwcKahatchee Mountain Group; Wash Creek Slate
    kwckKahatchee Mountain Group; Kalona Quartzite Member of Wash Creek Slate
    kwxKahatchee Mountain Group; Waxahatchee Slate
    MbBangor Limestone
    MbmBangor and Monteagle Limestones undivided in part
    mdaMitchell Dam Amphibolite
    MfFloyd Shale
    MfpFort Payne Chert
    mgnMotts Gneiss
    mgnaMotts Gneiss, Unnamed unit
    MhHartselle Sandstone
    miMad Indian Group
    migrMad Indian Group; Irregular zones of sericite-quartz schist
    MImMiocene Series undifferentiated
    MImMonteagle Limestone
    mmMoffits Mill Schist
    MpPennington Formation
    MpmPride Mountain Formation
    MpmmPride Mountain Formation and Monteagle Limestone undifferentiated
    MtTuscumbia Limestone
    MtfpTuscumbia Limestone and Fort Payne Chert undivided
    MuPaleozoic shale undifferentiated
    muMetaclastic rocks of unknown affinity
    myMylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    oaOpelika Complex; Auburn Gneiss
    OalAthens Shale and Lenoir Limestone undifferentiated
    oasOpelika Complex; Auburn Gneiss, Unnamed unit
    obOpelika Complex; Bottle Granite
    OcChickamauga Limestone
    OcaAttalla Chert Conglomerate Member of the Chickamauga Limestone
    OCccrChepultepec and Copper Ridge Dolomites undifferentiated
    OCkKnox Group undifferentiated
    OcmColvin Mountain Sandstone
    OgGreensport Formation
    OGEOrsClaiborne/Jackson Group; Residuum
    OGoOligocene Series undifferentiated
    OiInman Formation
    olOpelika Complex; Loachapoka Schist
    OloLittle Oak Limestone
    OlolLittle Oak and Lenoir Limestones undifferentiated
    OlonLittle Oak and Newala Limestones undifferentiated
    OlpLeipers Limestone
    OlvLongview Limestone
    OnNewala Limestone
    OnlvNewala and Longview Limestones undifferentiated
    OnvNashville Group
    OnvsrNashville and Stones River Groups undifferentiated
    ORaAthens Shale
    OsSequatchie Formation
    OscmgSequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated
    OsrStones River Groups undifferentiated in part
    OuOrdovician System undivided in part (Includes Sequatchie Formation, Elkmont Formation, Leipers Limestone, Inman Formation, Nashville Group, and Stones River Group)
    pbmPoe Bridge Mountain Group
    pbmgrPoe Bridge Mountain Group; Roscoelite-graphite quartz schist and graphitic quartzite
    pbmgtPoe Bridge Mountain Group; Garnet quartzite (garnetite) and garnitiferous altered mafic rock
    pcPine Mountain Group; Chewacla Marble
    phPine Mountain Group; Hollis Quartzite
    pmPine Mountain Group; Manchester Schist
    PMpwParkwood Formation
    PMpwfParkwood Formation and Floyd Shale undifferentiated
    PMpwpParkwood and Pennington Formations undifferentiated
    PNclMidway Group; Clayton Formation
    PNnMidway Group; Naheola Formation
    PNnfWilcox Group; Nanafalia Formation
    PNpcMidway Group; Porters Creek Formation
    PNsmWilcox Group; Salt Mountain Limestone
    PNtuWilcox Group; Tuscahoma Sand
    PpvPottsville Formation
    Ppv11Pottsville Formation (lower part)
    Ppv1uPottsville Formation (upper part)
    Ppv21Pottsville Formation (lower part)
    Ppv2uPottsville Formation (upper part)
    PSPOciCitronelle Formation
    PStHigh terrace deposits
    rgRockford Granite
    sfSylacauga Marble Group; Fayetteville Phyllite
    sgbSylacauga Marble Group; Gooch Branch Chert
    sgqSylacauga Marble Group; Gantts Quarry Formation
    sjSylacauga Marble Group; Jumbo Dolomite
    SrmRed Mountain Formation
    ssrcSylacauga Marble Group; Shelvin Rock Church Formation
    SuSilurian System undivided (Includes Wayne Group and Brassfield Limestone)
    tbrTalladega Group; Butting Ram Sandstone
    tldTalladega Group; Lay Dam Formation
    tldcTalladega Group; Cheaha Quartzite Member of Lay Dam Formation
    tlddTalladega Group; Lay Dam Formation, unnamed diamictite facies
    tldmTalladega Group; Miller Mill Quartzite Member of the Lay Dam Formation
    uhgUchee Complex; Hospilika Granite
    umUltramafic rock
    upcUchee Complex; Phenix City Gneiss
    Waterwater
    weWedowee Group; Wedowee Group undifferentiated
    wecWedowee Group; Cornhouse Schist
    wehWedowee Group; Hackneyville Schist
    whWacoochee Complex; Halawaka Schist
    wpcWacoochee Complex; Phelps Creek Gneiss
    wwmWacoochee Complex; Whatley Mill Gneiss
    zgZana Granite
    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
    at;7Almond Trondhjemite
    ba;7Beaverdam Amphibolite
    bm;9Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    bsg;7Bluff Springs Granite
    CAb;6Bibb Dolomite
    CAbf;6Brierfield Dolomite
    CAc;3Conasauga Formation
    CAc;5Conasauga Formation
    CAc;6Conasauga Formation
    CAch;6Chilhowee Group undifferentiated
    CAcl;6Conasauga Formation, lower unnamed shale facies
    CAcn;6Cochran Formation
    CAcr;5Copper Ridge Dolomite
    CAk;3Ketona Dolomite
    CAk;4Ketona Dolomite
    CAn;6Nichols Formation
    CAr;6Rome Formation
    cr;9Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    CAs;6Shady Dolomite
    CAwwr;6Weisner and Wilson Ridge Formations undifferentiated
    da;8Dadeville Complex; Agricola Schist
    Dc;2Chattanooga Shale
    Dc;3Chattanooga Shale
    Dc;4Chattanooga Shale
    Dcfm;4Chattanooga Shale and Frog Mountain Sandstone undifferentiated
    dch;8Dadeville Complex; Camp Hill Granite Gneiss
    Dfm;6Frog Mountain Sandstone
    dmum;8Dadeville Complex; Mafic and ultramafic rock
    drc;8Dadeville Complex; Ropes Creek Amphibolite
    drm;8Dadeville Complex; Rock Mills Granite Gneiss
    Dtjc;7Talladega Group; Jemison Chert and Chulafinnee Schist undifferentiated
    Dtjcc;7Talladega Group; No name on map
    dwgn;8Dadeville Complex; Waverly Gneiss
    dws;8Dadeville Complex; Waresville Schist
    egn;7Elkahatchee Quartz Diorite Gneiss
    em;7Emuckfaw Group; Emuckfaw Group undifferentiated in part
    emg;7Emuckfaw Group; Glenloch Schist
    EOgl;1Claiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part
    EOh;1Wilcox Group; Hatchetigbee Formation
    EOj;1Jackson Group undifferentiated
    EOl;1Claiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part
    EOt;1Claiborne Group; Tallahatta Formation
    Halt;0Alluvial, coastal and low terrace deposits
    hch;7Hatchet Creek Group; Hanover Schist
    hcp;7Hatchet Creek Group; Pinchoulee Gneiss
    hf;7Higgins Ferry Group
    hfgr;7Higgins Ferry Group; Roscoelite-graphite-quartz schist and graphitic quartzite
    hfgt;7Higgins Ferry Group; Garnet quartzite (garnetite) and garnitiferous altered mafic rock
    hg;7Hissop Granite
    hgs;7Hillabee Greenstone
    hgsf;7Hillabee Greenstone, unnamed dacite unit
    hp;7Heflin Phyllite
    jg;7Jacksons Gap Group; Jacksons Gap Group undifferentiated in part
    jgc;7Jacksons Gap Group; Jacksons Gap Group, Unnamed unit
    jgt;7Jacksons Gap Group; Tallassee Metaquartzite
    ka;7Ketchepedrakee Amphibolite
    kb;7Kahatchee Mountain Group; Brewer Phyllite
    kbs;7Kahatchee Mountain Group; Sawyer Limestone Member of Brewer Phyllite
    Kck;1Tuscaloosa Group; Coker Formation
    Kd;1Selma Group; Demopolis Chalk
    Ke;1Eutaw Formation
    Kg;1Tuscaloosa Group; Gordo Formation
    kgn;7Kowaliga Gneiss
    Km;1Selma Group; Mooreville Chalk
    Kp;1Selma Group; Providence Sand
    Kpb;1Selma Group; Prairie Bluff Chalk
    Kr;1Selma Group; Ripley Formation
    KRb;1Selma Group; Blufftown Formation
    Krc;1Selma Group; Cusseta Sand Member of the Ripley Formation
    ksc;7Kahatchee Mountain Group; Stumps Creek Formation
    Kt;1Tuscaloosa Group undifferentiated
    kwc;7Kahatchee Mountain Group; Wash Creek Slate
    kwck;7Kahatchee Mountain Group; Kalona Quartzite Member of Wash Creek Slate
    kwx;7Kahatchee Mountain Group; Waxahatchee Slate
    Mb;2Bangor Limestone
    Mb;3Bangor Limestone
    Mb;5Bangor Limestone
    Mbm;5Bangor and Monteagle Limestones undivided in part
    mda;7Mitchell Dam Amphibolite
    Mf;4Floyd Shale
    Mfp;2Fort Payne Chert
    Mfp;3Fort Payne Chert
    mgn;9Motts Gneiss
    mgna;9Motts Gneiss, Unnamed unit
    Mh;2Hartselle Sandstone
    Mh;3Hartselle Sandstone
    Mh;4Hartselle Sandstone
    mi;7Mad Indian Group
    migr;7Mad Indian Group; Irregular zones of sericite-quartz schist
    MIm;1Miocene Series undifferentiated
    MIm;2Monteagle Limestone
    MIm;3Monteagle Limestone
    MIm;5Monteagle Limestone
    mm;9Moffits Mill Schist
    Mp;2Pennington Formation
    Mp;3Pennington Formation
    Mpm;2Pride Mountain Formation
    Mpm;3Pride Mountain Formation
    Mpm;4Pride Mountain Formation
    Mpmm;2Pride Mountain Formation and Monteagle Limestone undifferentiated
    Mt;2Tuscumbia Limestone
    Mt;3Tuscumbia Limestone
    Mtfp;3Tuscumbia Limestone and Fort Payne Chert undivided
    Mtfp;5Tuscumbia Limestone and Fort Payne Chert undivided
    Mtfp;6Tuscumbia Limestone and Fort Payne Chert undivided
    Mu;5Paleozoic shale undifferentiated
    Mu;6Paleozoic shale undifferentiated
    mu;7Metaclastic rocks of unknown affinity
    my;9Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    oa;8Opelika Complex; Auburn Gneiss
    Oal;6Athens Shale and Lenoir Limestone undifferentiated
    oas;8Opelika Complex; Auburn Gneiss, Unnamed unit
    ob;8Opelika Complex; Bottle Granite
    Oc;3Chickamauga Limestone
    Oc;5Chickamauga Limestone
    Oca;3Attalla Chert Conglomerate Member of the Chickamauga Limestone
    Oca;5Attalla Chert Conglomerate Member of the Chickamauga Limestone
    OCAccr;3Chepultepec and Copper Ridge Dolomites undifferentiated
    OCAccr;5Chepultepec and Copper Ridge Dolomites undifferentiated
    OCAccr;6Chepultepec and Copper Ridge Dolomites undifferentiated
    OCAk;3Knox Group undifferentiated
    OCAk;4Knox Group undifferentiated
    Ocm;6Colvin Mountain Sandstone
    Og;6Greensport Formation
    OGEOrs;1Claiborne/Jackson Group; Residuum
    OGo;1Oligocene Series undifferentiated
    Oi;3Inman Formation
    ol;8Opelika Complex; Loachapoka Schist
    Olo;6Little Oak Limestone
    Olol;6Little Oak and Lenoir Limestones undifferentiated
    Olon;6Little Oak and Newala Limestones undifferentiated
    Olp;3Leipers Limestone
    Olv;6Longview Limestone
    On;6Newala Limestone
    Onlv;6Newala and Longview Limestones undifferentiated
    Onv;3Nashville Group
    Onvsr;3Nashville and Stones River Groups undifferentiated
    ORa;6Athens Shale
    Os;2Sequatchie Formation
    Os;3Sequatchie Formation
    Os;5Sequatchie Formation
    Os;6Sequatchie Formation
    Oscmg;5Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated
    Oscmg;6Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated
    Osr;3Stones River Groups undifferentiated in part
    Ou;2Ordovician System undivided in part (Includes Sequatchie Formation, Elkmont Formation, Leipers Limestone, Inman Formation, Nashville Group, and Stones River Group)
    pbm;7Poe Bridge Mountain Group
    pbmgr;7Poe Bridge Mountain Group; Roscoelite-graphite quartz schist and graphitic quartzite
    pbmgt;7Poe Bridge Mountain Group; Garnet quartzite (garnetite) and garnitiferous altered mafic rock
    pc;9Pine Mountain Group; Chewacla Marble
    ph;9Pine Mountain Group; Hollis Quartzite
    pm;9Pine Mountain Group; Manchester Schist
    PAMpw;2Parkwood Formation
    PAMpw;4Parkwood Formation
    PAMpwf;4Parkwood Formation and Floyd Shale undifferentiated
    PAMpwp;3Parkwood and Pennington Formations undifferentiated
    PAMpwp;5Parkwood and Pennington Formations undifferentiated
    PApv;3Pottsville Formation
    PApv11;3Pottsville Formation (lower part)
    PApv1u;3Pottsville Formation (upper part)
    PApv21;4Pottsville Formation (lower part)
    PApv2u;4Pottsville Formation (upper part)
    PNcl;1Midway Group; Clayton Formation
    PNn;1Midway Group; Naheola Formation
    PNnf;1Wilcox Group; Nanafalia Formation
    PNpc;1Midway Group; Porters Creek Formation
    PNsm;1Wilcox Group; Salt Mountain Limestone
    PNtu;1Wilcox Group; Tuscahoma Sand
    PSPOci;1Citronelle Formation
    PSt;0High terrace deposits
    rg;7Rockford Granite
    sf;7Sylacauga Marble Group; Fayetteville Phyllite
    sgb;7Sylacauga Marble Group; Gooch Branch Chert
    sgq;7Sylacauga Marble Group; Gantts Quarry Formation
    sj;7Sylacauga Marble Group; Jumbo Dolomite
    Srm;3Red Mountain Formation
    Srm;5Red Mountain Formation
    Srm;6Red Mountain Formation
    ssrc;7Sylacauga Marble Group; Shelvin Rock Church Formation
    Su;2Silurian System undivided (Includes Wayne Group and Brassfield Limestone)
    tbr;7Talladega Group; Butting Ram Sandstone
    tld;7Talladega Group; Lay Dam Formation
    tldc;7Talladega Group; Cheaha Quartzite Member of Lay Dam Formation
    tldd;7Talladega Group; Lay Dam Formation, unnamed diamictite facies
    tldm;7Talladega Group; Miller Mill Quartzite Member of the Lay Dam Formation
    uhg;9Uchee Complex; Hospilika Granite
    um;7Ultramafic rock
    upc;9Uchee Complex; Phenix City Gneiss
    water;0water
    we;7Wedowee Group; Wedowee Group undifferentiated
    wec;7Wedowee Group; Cornhouse Schist
    weh;7Wedowee Group; Hackneyville Schist
    wh;9Wacoochee Complex; Halawaka Schist
    wpc;9Wacoochee Complex; Phelps Creek Gneiss
    wwm;9Wacoochee Complex; Whatley Mill Gneiss
    zg;7Zana Granite
    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
    ALat;7Almond Trondhjemite
    ALba;7Beaverdam Amphibolite
    ALbm;9Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    ALbsg;7Bluff Springs Granite
    ALCAb;6Bibb Dolomite
    ALCAbf;6Brierfield Dolomite
    ALCAc;3Conasauga Formation
    ALCAc;5Conasauga Formation
    ALCAc;6Conasauga Formation
    ALCAch;6Chilhowee Group undifferentiated
    ALCAcl;6Conasauga Formation, lower unnamed shale facies
    ALCAcn;6Cochran Formation
    ALCAcr;5Copper Ridge Dolomite
    ALCAk;3Ketona Dolomite
    ALCAk;4Ketona Dolomite
    ALCAn;6Nichols Formation
    ALCAr;6Rome Formation
    ALcr;9Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    ALCAs;6Shady Dolomite
    ALCAwwr;6Weisner and Wilson Ridge Formations undifferentiated
    ALda;8Dadeville Complex; Agricola Schist
    ALDc;2Chattanooga Shale
    ALDc;3Chattanooga Shale
    ALDc;4Chattanooga Shale
    ALDcfm;4Chattanooga Shale and Frog Mountain Sandstone undifferentiated
    ALdch;8Dadeville Complex; Camp Hill Granite Gneiss
    ALDfm;6Frog Mountain Sandstone
    ALdmum;8Dadeville Complex; Mafic and ultramafic rock
    ALdrc;8Dadeville Complex; Ropes Creek Amphibolite
    ALdrm;8Dadeville Complex; Rock Mills Granite Gneiss
    ALDtjc;7Talladega Group; Jemison Chert and Chulafinnee Schist undifferentiated
    ALDtjcc;7Talladega Group; No name on map
    ALdwgn;8Dadeville Complex; Waverly Gneiss
    ALdws;8Dadeville Complex; Waresville Schist
    ALegn;7Elkahatchee Quartz Diorite Gneiss
    ALem;7Emuckfaw Group; Emuckfaw Group undifferentiated in part
    ALemg;7Emuckfaw Group; Glenloch Schist
    ALEOgl;1Claiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part
    ALEOh;1Wilcox Group; Hatchetigbee Formation
    ALEOj;1Jackson Group undifferentiated
    ALEOl;1Claiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part
    ALEOt;1Claiborne Group; Tallahatta Formation
    ALHalt;0Alluvial, coastal and low terrace deposits
    ALhch;7Hatchet Creek Group; Hanover Schist
    ALhcp;7Hatchet Creek Group; Pinchoulee Gneiss
    ALhf;7Higgins Ferry Group
    ALhfgr;7Higgins Ferry Group; Roscoelite-graphite-quartz schist and graphitic quartzite
    ALhfgt;7Higgins Ferry Group; Garnet quartzite (garnetite) and garnitiferous altered mafic rock
    ALhg;7Hissop Granite
    ALhgs;7Hillabee Greenstone
    ALhgsf;7Hillabee Greenstone, unnamed dacite unit
    ALhp;7Heflin Phyllite
    ALjg;7Jacksons Gap Group; Jacksons Gap Group undifferentiated in part
    ALjgc;7Jacksons Gap Group; Jacksons Gap Group, Unnamed unit
    ALjgt;7Jacksons Gap Group; Tallassee Metaquartzite
    ALka;7Ketchepedrakee Amphibolite
    ALkb;7Kahatchee Mountain Group; Brewer Phyllite
    ALkbs;7Kahatchee Mountain Group; Sawyer Limestone Member of Brewer Phyllite
    ALKck;1Tuscaloosa Group; Coker Formation
    ALKd;1Selma Group; Demopolis Chalk
    ALKe;1Eutaw Formation
    ALKg;1Tuscaloosa Group; Gordo Formation
    ALkgn;7Kowaliga Gneiss
    ALKm;1Selma Group; Mooreville Chalk
    ALKp;1Selma Group; Providence Sand
    ALKpb;1Selma Group; Prairie Bluff Chalk
    ALKr;1Selma Group; Ripley Formation
    ALKRb;1Selma Group; Blufftown Formation
    ALKrc;1Selma Group; Cusseta Sand Member of the Ripley Formation
    ALksc;7Kahatchee Mountain Group; Stumps Creek Formation
    ALKt;1Tuscaloosa Group undifferentiated
    ALkwc;7Kahatchee Mountain Group; Wash Creek Slate
    ALkwck;7Kahatchee Mountain Group; Kalona Quartzite Member of Wash Creek Slate
    ALkwx;7Kahatchee Mountain Group; Waxahatchee Slate
    ALMb;2Bangor Limestone
    ALMb;3Bangor Limestone
    ALMb;5Bangor Limestone
    ALMbm;5Bangor and Monteagle Limestones undivided in part
    ALmda;7Mitchell Dam Amphibolite
    ALMf;4Floyd Shale
    ALMfp;2Fort Payne Chert
    ALMfp;3Fort Payne Chert
    ALmgn;9Motts Gneiss
    ALmgna;9Motts Gneiss, Unnamed unit
    ALMh;2Hartselle Sandstone
    ALMh;3Hartselle Sandstone
    ALMh;4Hartselle Sandstone
    ALmi;7Mad Indian Group
    ALmigr;7Mad Indian Group; Irregular zones of sericite-quartz schist
    ALMIm;1Miocene Series undifferentiated
    ALMIm;2Monteagle Limestone
    ALMIm;3Monteagle Limestone
    ALMIm;5Monteagle Limestone
    ALmm;9Moffits Mill Schist
    ALMp;2Pennington Formation
    ALMp;3Pennington Formation
    ALMpm;2Pride Mountain Formation
    ALMpm;3Pride Mountain Formation
    ALMpm;4Pride Mountain Formation
    ALMpmm;2Pride Mountain Formation and Monteagle Limestone undifferentiated
    ALMt;2Tuscumbia Limestone
    ALMt;3Tuscumbia Limestone
    ALMtfp;3Tuscumbia Limestone and Fort Payne Chert undivided
    ALMtfp;5Tuscumbia Limestone and Fort Payne Chert undivided
    ALMtfp;6Tuscumbia Limestone and Fort Payne Chert undivided
    ALMu;5Paleozoic shale undifferentiated
    ALMu;6Paleozoic shale undifferentiated
    ALmu;7Metaclastic rocks of unknown affinity
    ALmy;9Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones
    ALoa;8Opelika Complex; Auburn Gneiss
    ALOal;6Athens Shale and Lenoir Limestone undifferentiated
    ALoas;8Opelika Complex; Auburn Gneiss, Unnamed unit
    ALob;8Opelika Complex; Bottle Granite
    ALOc;3Chickamauga Limestone
    ALOc;5Chickamauga Limestone
    ALOca;3Attalla Chert Conglomerate Member of the Chickamauga Limestone
    ALOca;5Attalla Chert Conglomerate Member of the Chickamauga Limestone
    ALOCAccr;3Chepultepec and Copper Ridge Dolomites undifferentiated
    ALOCAccr;5Chepultepec and Copper Ridge Dolomites undifferentiated
    ALOCAccr;6Chepultepec and Copper Ridge Dolomites undifferentiated
    ALOCAk;3Knox Group undifferentiated
    ALOCAk;4Knox Group undifferentiated
    ALOcm;6Colvin Mountain Sandstone
    ALOg;6Greensport Formation
    ALOGEOrs;1Claiborne/Jackson Group; Residuum
    ALOGo;1Oligocene Series undifferentiated
    ALOi;3Inman Formation
    ALol;8Opelika Complex; Loachapoka Schist
    ALOlo;6Little Oak Limestone
    ALOlol;6Little Oak and Lenoir Limestones undifferentiated
    ALOlon;6Little Oak and Newala Limestones undifferentiated
    ALOlp;3Leipers Limestone
    ALOlv;6Longview Limestone
    ALOn;6Newala Limestone
    ALOnlv;6Newala and Longview Limestones undifferentiated
    ALOnv;3Nashville Group
    ALOnvsr;3Nashville and Stones River Groups undifferentiated
    ALORa;6Athens Shale
    ALOs;2Sequatchie Formation
    ALOs;3Sequatchie Formation
    ALOs;5Sequatchie Formation
    ALOs;6Sequatchie Formation
    ALOscmg;5Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated
    ALOscmg;6Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated
    ALOsr;3Stones River Groups undifferentiated in part
    ALOu;2Ordovician System undivided in part (Includes Sequatchie Formation, Elkmont Formation, Leipers Limestone, Inman Formation, Nashville Group, and Stones River Group)
    ALpbm;7Poe Bridge Mountain Group
    ALpbmgr;7Poe Bridge Mountain Group; Roscoelite-graphite quartz schist and graphitic quartzite
    ALpbmgt;7Poe Bridge Mountain Group; Garnet quartzite (garnetite) and garnitiferous altered mafic rock
    ALpc;9Pine Mountain Group; Chewacla Marble
    ALph;9Pine Mountain Group; Hollis Quartzite
    ALpm;9Pine Mountain Group; Manchester Schist
    ALPAMpw;2Parkwood Formation
    ALPAMpw;4Parkwood Formation
    ALPAMpwf;4Parkwood Formation and Floyd Shale undifferentiated
    ALPAMpwp;3Parkwood and Pennington Formations undifferentiated
    ALPAMpwp;5Parkwood and Pennington Formations undifferentiated
    ALPApv;3Pottsville Formation
    ALPApv11;3Pottsville Formation (lower part)
    ALPApv1u;3Pottsville Formation (upper part)
    ALPApv21;4Pottsville Formation (lower part)
    ALPApv2u;4Pottsville Formation (upper part)
    ALPNcl;1Midway Group; Clayton Formation
    ALPNn;1Midway Group; Naheola Formation
    ALPNnf;1Wilcox Group; Nanafalia Formation
    ALPNpc;1Midway Group; Porters Creek Formation
    ALPNsm;1Wilcox Group; Salt Mountain Limestone
    ALPNtu;1Wilcox Group; Tuscahoma Sand
    ALPSPOci;1Citronelle Formation
    ALPSt;0High terrace deposits
    ALrg;7Rockford Granite
    ALsf;7Sylacauga Marble Group; Fayetteville Phyllite
    ALsgb;7Sylacauga Marble Group; Gooch Branch Chert
    ALsgq;7Sylacauga Marble Group; Gantts Quarry Formation
    ALsj;7Sylacauga Marble Group; Jumbo Dolomite
    ALSrm;3Red Mountain Formation
    ALSrm;5Red Mountain Formation
    ALSrm;6Red Mountain Formation
    ALssrc;7Sylacauga Marble Group; Shelvin Rock Church Formation
    ALSu;2Silurian System undivided (Includes Wayne Group and Brassfield Limestone)
    ALtbr;7Talladega Group; Butting Ram Sandstone
    ALtld;7Talladega Group; Lay Dam Formation
    ALtldc;7Talladega Group; Cheaha Quartzite Member of Lay Dam Formation
    ALtldd;7Talladega Group; Lay Dam Formation, unnamed diamictite facies
    ALtldm;7Talladega Group; Miller Mill Quartzite Member of the Lay Dam Formation
    ALuhg;9Uchee Complex; Hospilika Granite
    ALum;7Ultramafic rock
    ALupc;9Uchee Complex; Phenix City Gneiss
    ALwater;0water
    ALwe;7Wedowee Group; Wedowee Group undifferentiated
    ALwec;7Wedowee Group; Cornhouse Schist
    ALweh;7Wedowee Group; Hackneyville Schist
    ALwh;9Wacoochee Complex; Halawaka Schist
    ALwpc;9Wacoochee Complex; Phelps Creek Gneiss
    ALwwm;9Wacoochee Complex; Whatley Mill Gneiss
    ALzg;7Zana Granite
    source
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser)
    ValueDefinition
    AL001Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery, T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
    AL201Polygons have been updated from source by C.L. Dicken.
    unit_age
    The geologic age from the source map used.

    type: character width: 60 output width: 60 (Source: Doug Stoeser)
    ValueDefinition
    Cambrian 
    Cambrian? 
    Cambrian?-Ordovician? 
    Cretaceous 
    Devonian 
    Eocene 
    Eocene-Oligocene 
    Holocene 
    Miocene 
    Mississippian 
    Oligocene 
    Ordovician 
    Ordovician-Cambrian 
    Paleocene 
    Paleozoic 
    Pennsylvanian 
    Pennsylvanian-Mississippian 
    Pleistocene 
    Pleistocene-Pliocene 
    Precambrian-Paleozoic 
    Precambrian?-Cambrian? 
    Silurian 
    Silurian?-Devonian 
    Upper Cretaceous 
    rocktype1
    The predominant lithology found in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1a)
    ValueDefinition
    alluvium 
    amphibolite 
    arkose 
    augen gneiss 
    conglomerate 
    chert 
    clay or mud 
    claystone 
    conglomerate 
    dacite 
    dolostone (dolomite) 
    felsic gneiss 
    gneiss 
    granite 
    granitic gneiss 
    granodiorite 
    greenstone 
    limestone 
    mafic gneiss 
    marble 
    metasedimentary rock 
    mica schist 
    mudstone 
    mylonite 
    orthogneiss 
    phyllite 
    pyroxenite 
    quartz diorite 
    quartz monzonite 
    quartz-feldspar schist 
    quartzite 
    residuum 
    sand 
    sandstone 
    schist 
    shale 
    silt 
    slate 
    terrace 
    tonalite 
    trondhjemite 
    water 
    rocktype2
    The second most predominant lithology in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1a)
    ValueDefinition
    amphibolite 
    beach sand 
    bentonite 
    carbonate 
    chert 
    clay or mud 
    claystone 
    conglomerate 
    dolostone (dolomite) 
    gneiss 
    granite 
    granitic gneiss 
    granodiorite 
    limestone 
    mafic gneiss 
    mafic metavolcanic rock 
    meta-conglomerate 
    metasedimentary rock 
    mica schist 
    migmatite 
    mixed clastic/carbonate 
    mudstone 
    pegmatite 
    phyllite 
    phyllonite 
    quartz monzonite 
    quartzite 
    sand 
    sandstone 
    schist 
    shale 
    silt 
    siltstone 
    slate 
    al_geol.aat
    Arc attribute table for Alabama 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
    3contact, location inferred, queried
    4normal fault, location certain, digitized with upthrown side on the right (code of 1 added to arc-para1 where U/D is designated in source)
    6normal fault, location inferred, queried, digitized with upthrown side on the right (code of 1 added to arc-para1 where U/D is designated in source)
    7shoreline or riverbank
    10thrust fault, location certain, teeth on right from origin (angle of thrusting added to arc-para1 where designated in source)
    12thrust fault, location inferred, queried, teeth on right from origin (angle of thrusting added to arc-para1 where designated in source)
    30fault, sense of displacement unknown or undefined, location certain
    32fault, sense of displacement unknown or undefined, location inferred or queried
    52normal fault, concealed
    53thrust fault, concealed
    87right lateral fault, location certain
    90left lateral fault, location certain
    100fault, sense of displacement unknown or undefined, concealed
    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
    1U/D is designated in source
    arc-para2
    "Scratch" field used mostly in Alaska.

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    100nature of contact uncertain (may possibly be a fault or a stratigraphic contact)
    source
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser)
    ValueDefinition
    AL001Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery, T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
    AL102Arcs that have been flipped from source by C.L. Dicken.
    AL101Arcs that have been added/edited by C.L. Dicken by using the paper source material (AL001).
    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, Chapter A)
    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    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
    

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  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 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?
    al geology (source 1 of 4)
    Szabo, Michael W., Charles W. Copelnad, Jr., Mancini, Ernest A., and Geolgical Survey of Alabama, 1988, Geologic Map of Alabama: Geological Survey of Alabama Special Map 220, Geological Survey of Alabama, Tuscaloosa, Alabama.

    Online Links:

    Other_Citation_Details:
    Composed of four map sheets. Southeast, southwest, northeast and northwest.
    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 250,000
    Source_Contribution:
    provided unit descriptions and base for error checking of attributes.
    al digital geology (source 2 of 4)
    Geological Survey of Alabama, and U.S. Geological Survey, 1997, Digital Geologic Map of Alabama: Special Map 220, unknown, unknown.

    Online Links:

    Other_Citation_Details:
    The digital map was digitized from the published 1988 Geologic Map of Alabama.

    Digital files are not available publically as of this metadata data (April 2005). Shapefiles and coverages were obtained internally.
    Type_of_Source_Media: ArcIMS website
    Source_Scale_Denominator: 250000
    Source_Contribution: provided linework and some polygon attribute data.
    state boundaries (source 3 of 4)
    Johnson, Bruce R., 1:100,000 Scale State Boundaries of the Conterminous United States.

    Other_Citation_Details:
    Arc/INFO coverage developed by Bruce Johnson. Derived from USGS 100,000-scale DLG boundary layer quadrangles.
    Type_of_Source_Media: online
    Source_Scale_Denominator: 100000
    Source_Contribution: provided linework of the conterminous state boundaries
    lithclass (source 4 of 4)
    Johnson, Bruce R., Geologic Map Unit Classification, ver. 6.1.

    Other_Citation_Details:
    Document has been modified and is included in Appedices of the publication.
    Type_of_Source_Media: digital data
    Source_Contribution:
    Source of lithologic codes and specific rock names found in ROCKTYPE1 and ROCKTYPE2.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 13)
    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: 03-Feb-2005 (process 2 of 13)
    C.L. Dicken obtained the digital geologic map of Alabama from Julia Mueller. A digital geologic map of Alabama, produced by the Geological Survey of Alabama under contract, was provided to Julia Mueller by Andrew Grosz at the U.S. Geological Survey during the summer of 1998.

    The coverage was re-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:		0.00000
    false northing:		0.00000
    
    All attributes were deleted except map_code.

    (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 map_code where then calculated into a new field called orig_label.
    Date: 03-Feb-2005 (process 3 of 13)
    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: 04-Feb-2005 (process 4 of 13)
    All arcs were selected and the command unsplit none was performed. This reduced the number of arcs from over 30,000 to around 15,000.
    Date: 01-Mar-2005 (process 5 of 13)
    Next, in preparing the uniform .aat file, 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: 01-Mar-2005 (process 6 of 13)
    In the digital file, there were a few polygons that had to be retagged because of an error in the file. The following changes were made based on paper source (AL001):

    Onsvr was changed to Onvsr
    htgt was changed to hfgt
    2 polygons of Cr were changed to cr
    TI was changed to Tl (upper case i changed to lower case L)
    Mpm changed to Mb (one polygon)
    MIm changed to Mpm (one polygon)
    Mtfp changed to Mf (one polygon)
    Mtfp changed to Mpm (one polygon)
    Oc changed to Srm (one polygon)
    Srm changed to Dcfm (one polygon)
    Dcfm changed to Mtfp (one polygon)
    Oc changed to PMpwf (one polygon)
    Mtfp changed to PMpwf (one polygon)
    Srm changed to Mtfp (one polygon)
    Mt changed to Mf (two polygons)
    Split the following polgyons: Mb(two polygons), Mt and OCAccr
    
    Date: 09-Mar-2005 (process 7 of 13)
    The following attributes were exported from Filemaker 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. IN001) 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

    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: 09-Mar-2005 (process 8 of 13)
    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. orig_label was used as the merge item.

    Special attention was taken to this join because there are multiple units that have more than one province assoicated with the orig_label. Due to this, when joining on orig_label, not all polygons will have the correct attributes associated with them. C.L. Dicken had to go into the coverage after the join and manually update those units with multiple provinces. There are 21 units in Alabama.

    Also the following units were retagged with source AL201 to indicate changes from the source:

    Onvsr hfgt cr Tl

    Date: 15-Mar-2005 (process 9 of 13)
    Arc-code was populated using the paper map source to tag the lines using the AAT line type data dictionary (see Chapter A in this series).

    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 Chapter A)

    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: 16-Mar-2005 (process 10 of 13)
    Some arcs were in the wrong direction and had to be flipped in order for their directions to be correct when attributing such lines as thrust faults. These specific arcs have a source code of AL102 to indicate a direction change from the source arcs.
    Date: 06-Apr-2005 (process 11 of 13)
    Once the .aat and the .pat were populated with the correct attributes, the coverage was exported as an .e00 file (algeol_lcc.e00).

    Then it was unprojected into geographic coordinates and exported again (algeol_dd.e00).
    Date: 06-Apr-2005 (process 12 of 13)
    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 alfaults_lcc.e00) and then unprojected into geographic coordinates and exported again (alfaults_dd.e00).
    Date: 06-Apr-2005 (process 13 of 13)
    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 Alabama state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1: 100,000 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
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)
    http://www.usgs.gov/contact/
  2. What's the catalog number I need to order this data set?
  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?

Who wrote the metadata?

Dates:
Last modified: 15-Mar-2005
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/al.faq.html>

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