Geologic Map of Alaska: geologic units

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Frequently anticipated questions:


What does this data set describe?

Title: Geologic Map of Alaska: geologic units
Abstract:
This dataset consists of a polygon coverage and associated attribute data derived from the 1980 Geologic Map of Alaska compiled by H.M. Beikman and published by the U.S. Geological Survey. The map is a regional summary of geologic formations and units that can be shown cartographically at 1:2,500,000. This digital dataset includes all 184 map units from the original map. 182 are geologic units; the others are polygons for large glaciers and lakes. This coverage is not intended to be a complete representation of the printed geologic map. It does NOT include faults, locations of volcanoes or volcanic vents, the map explanation, correlation charts or description of map units.
  1. How might this data set be cited?
    U.S. Geological Survey, 1997, Geologic Map of Alaska: geologic units: U.S. Geological Survey, Anchorage, AK.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: 167.0
    East_Bounding_Coordinate: -130.0
    North_Bounding_Coordinate: 72.0
    South_Bounding_Coordinate: 51.0
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1997
    Currentness_Reference:
    Creation of the digital coverage
  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. It contains the following vector data types (SDTS terminology):
      • Point (5069)
      • String (11131)
      • GT-polygon composed of chains (5070)
    2. What coordinate system is used to represent geographic features?
      The map projection used is Albers Conical Equal Area.
      Projection parameters:
      Standard_Parallel: 55.0
      Standard_Parallel: 65.0
      Longitude_of_Central_Meridian: -154.0
      Latitude_of_Projection_Origin: 50.0
      False_Easting: 0.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      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?
    BEIKMAN.PAT
    Geologic units
    CODE
    Numerical code used to differentiate geologic units
    BEIKMAN.AAT
    Attribute table of BEIKMAN
    BEIKMAN.LUT
    Explains coding used in BEIKMAN.PAT
    CODE
    Numerical code used to differentiate geologic units
    ValueDefinition
    101Qhvf
    102Tvf
    103TKvf
    104uKvf
    105Kvf
    106vf
    201Qhvi
    202Qpvi
    203Qvi
    204QTvi
    205Tmvi
    206lTvi
    207Tvi
    208lKvi
    209Kvi
    210KJvi
    211Jvi
    301Qhvm
    302Qpvm
    303Qvm
    304QTvm
    305lTvm
    306Tvm
    307TKvm
    308KJvm
    309TRvm
    310JPvm
    311MzPzvm
    312Pvm
    313Dvm
    314Cvm
    315Pzvm
    401Qhv
    402Qpv
    403Qv
    404QTv
    405Tpv
    406Tmv
    407uTv
    408Txv
    409lTv
    410Tv
    411TKv
    412lKv
    413Kv
    414KJv
    415Dv
    416Ov
    417Zv
    501Tmif
    502Toif
    503Teif
    504Txif
    505Tif
    506TKif
    507TMzif
    508uKif
    509Kif
    510Jif
    511Mzif
    512MzPzif
    513IPif
    514uPzif
    515if
    601mTii
    602Tii
    603TKii
    604uKii
    605Kii
    606KJii
    607Jii
    608JTRii
    609Mzii
    610MzPzii
    611Sii
    612Pzii
    701Tmim
    702mTim
    703Tim
    704TKim
    705TMzim
    706Kim
    707Jim
    708Mzim
    709Pim
    710IPim
    711uPzim
    712lPzim
    713Pzim
    714Zim
    715im
    801Ti
    802TKi
    803uKi
    804Ki
    805Mzi
    806MzPzi
    807IPi
    808Oi
    809Pzi
    810lPzpCi
    811PzpCi
    812i
    901Tu
    902TKu
    903Ku
    904Mzu
    905JPu
    906MzPzu
    907IPu
    908Ou
    909lPzu
    910Pzu
    911u
    1001Q
    1002Qh
    1003Qp
    1011T
    1012mT
    1013uT
    1014lT
    1015Tp
    1016Tm
    1017To
    1018Te
    1100MzPz
    1111K
    1112uK
    1113lK
    1121KJ
    1122KJ1
    1123KJ2
    1124KJ3
    1131J
    1132uJ
    1133mJ
    1134lJ
    1141JP
    1142JM
    1151JTR
    1152TR
    1153uTR
    1154TRP
    1155TRD
    1161P
    1162PIP
    1163IP
    1164IPM
    1165Pz
    1166uPz
    1167lPz
    1171M
    1172MD
    1173D
    1174uD
    1175umD
    1176DS
    1181S
    1182O
    1183SO
    1184C
    1185OpC
    1191lPzpC
    1192Z
    1193Z1
    1194Z2
    1211Tpc
    1212uTc
    1221Tmc
    1222mTc
    1223lTc
    1224Txc
    1225Tc
    1226TKc
    1231uKc
    1232lKc
    1311lJm
    1321Mzm
    1322JPm
    1331Pzm
    1341PzpCm
    MAP_UNIT_ABBREV
    Abbreviation for geologic map units (i.e. labels used on printed map). (Source: Beikman, H.M., 1980, Geologic Map of Alaska.)
    ValueDefinition
    QhvfHolocene felsic volcanic rocks
    TvfTertiary felsic volcanic rocks
    TKvfTertiary and(or) Cretaceous felsic volcanic rocks
    uKvfupper Cretaceous felsic volcanic rocks
    KvfCretaceous felsic volcanic rocks
    vffelsic volcanic rocks, age unknown
    QhviHolocene intermediate volcanic rocks
    QpviPleistocene intermediate volcanic rocks
    QviQuaternary intermediate volcanic rocks
    QTviQuaternary or Tertiary intermediate volcanic rocks
    TmviMiocene intermediate volcanic rocks
    lTvilower Tertiary intermediate volcanic rocks
    TviTertiary intermediate volcanic rocks
    lKvilower Cretaceous intermediate volcanic rocks
    KviCretaceous intermediate volcanic rocks
    KJviCretaceous and(or) Jurassic intermediate volcanic rocks
    JviJurassic intermediate volcanic rocks
    QhvmHolocene mafic volcanic rocks
    QpvmPleistocene mafic volcanic rocks
    QvmQuaternary mafic volcanic rocks
    QTvmQuaternary or Tertiary mafic volcanic rocks
    lTvmlower Tertiary mafic volcanic rocks
    TvmTertiary mafic volcanic rocks
    TKvmTertiary and(or) Cretaceous mafic volcanic rocks
    KJvmCretaceous and(or) Jurassic mafic volcanic rocks
    TRvmTriassic mafic volcanic rocks
    JPvmJurassic, Triassic, and Permian mafic volcanic rocks
    MzPzvmPaleozoic and Mesozoic mafic volcanic rocks
    PvmPermian mafic volcanic rocks
    DvmDevonian mafic volcanic rocks
    CvmCambrian mafic volcanic rocks
    PzvmPaleozoic mafic volcanic rocks
    QhvHolocene mafic volcanic rocks
    QpvPleistocene mafic volcanic rocks
    QvQuaternary mafic volcanic rocks
    QTvQuaternary or Tertiary mafic volcanic rocks
    TpvPliocene mafic volcanic rocks
    TmvMiocene mafic volcanic rocks
    uTvupper Tertiary mafic volcanic rocks
    TxvPaleocene mafic volcanic rocks
    lTvlower Tertiary mafic rocks
    TvTertiary mafic volcanic rocks
    TKvTertiary and(or) Cretaceous mafic volcanic rocks
    lKvlower Cretaceous mafic volcanic rocks
    KvCretaceous mafic volcanic rocks
    KJvCretaceous and(or) Jurassic mafic volcanic rocks
    DvDevonian mafic volcanic rocks
    OvOrdovician mafic volcanic rocks
    ZvPrecambrian Z mafic volcanic rocks
    TmifMiocene felsic intrusive rocks
    ToifOligocene felsic intrusive rocks
    TeifEocene felsic intrusive rocks
    TxifPaleocene felsic intrusive rocks
    TifTertiary felsic intrusive rocks
    TKifTertiary and(or) Cretaceous felsic intrusive rocks
    TMzifTertiary and(or) Mesozoic felsic intrusive rocks
    uKifupper Cretaceous felsic intrusive rocks
    KifCretaceous felsic intrusive rocks
    JifJurassic felsic intrusive rocks
    MzifMesozoic felsic intrusive rocks
    MzPzifMesozoic and Paleozoic felsic intrusive rocks
    IPifPennsylvanian felsic intrusive rocks
    uPzifupper Paleozoic felsic intrusive rocks
    iffelsic intrusive rocks, age unknown
    mTiimiddle Tertiary intermediate intrusive rocks
    TiiTertiary intermediate intrusive rocks
    TKiiTertiary and(or) Cretaceous intermediate intrusive rocks
    uKiiupper Cretaceous intermediate intrusive rocks
    KiiCretaceous intermediate intrusive rocks
    KJiiCretaceous and(or) Jurassic intermediate intrusive rocks
    JiiJurassic intermediate intrusive rocks
    JTRiiJurassic and(or) Triassic intermediate intrusive rocks
    MziiMesozoic intermediate intrusive rocks
    MzPziiMesozoic and Paleozoic intermediate intrusive rocks
    SiiSilurian intermediate intrusive rocks
    PziiPaleozoic intermediate intrusive rocks
    TmimMiocene mafic intrusive rocks
    mTimmiddle Tertiary intermediate intrusive rocks
    TimTertiary mafic intrusive rocks
    TKimTertiary and(or) Cretaceous mafic intrusive rocks
    TMzimTertiary and(or) Mesozoic mafic intrusive rocks
    KimCretaceous mafic intrusive rocks
    JimJurassic mafic intrusive rocks
    MzimMesozoic mafic intrusive rocks
    PimPermian mafic intrusive rocks
    IPimPennsylvanian mafic intrusive rocks
    uPzimupper Paleozoic mafic intrusive rocks
    lPzimlower Paleozoic mafic intrusive rocks
    PzimPaleozoic mafic intrusive rocks
    ZimPrecambrian Z mafic intrusive rocks
    immafic intrusive rocks, age unknown
    TiTertiary mafic intrusive rocks
    TKiTertiary and(or) Cretaceous mafic intrusive rocks
    uKiupper Cretaceous mafic intrusive rocks
    KiCretaceous mafic rocks
    MziMesozoic mafic intrusive rocks
    MzPziMesozoic and Paleozoic mafic intrusive rocks
    IPiPennsylvanian mafic intrusive rocks
    OiOrdovician mafic intrusive rocks
    PziPaleozoic mafic intrusive rocks
    lPzpCilower Paleozoic and(or) Precambrian mafic intrusive rocks
    PzpCiPaleozoic and(or) Precambrian mafic intrusive rocks
    imafic intrusive rocks, age unknown
    TuTertiary ultramafic rocks
    TKuTertiary and(or) Cretaceous ultramafic rocks
    KuCretaceous ultramafic rocks
    MzuMesozoic ultramafic rocks
    JPuJurassic, Triassic, and Permian ultramafic rocks
    MzPzuMesozoic and Paleozoic ultramafic rocks
    IPuPennsylvanian ultramafic rocks
    OuOrdovician ultramafic rocks
    lPzulower Paleozoic ultramafic rocks
    PzuPaleozoic ultramafic rocks
    uultramafic rocks, age unknown
    QQuaternary deposits
    QhHolocene deposits
    QpPleistocene deposits
    TTertiary rocks
    mTmiddle Tertiary rocks
    uTupper Tertiary rocks
    lTlower Tertiary rocks
    TpPliocene rocks
    TmMiocene rocks
    ToOligocene rocks
    TeEocene rocks
    MzPzMesozoic and Paleozoic rocks
    KCretaceous rocks
    uKupper Cretaceous rocks
    lKlower Cretaceous rocks
    KJCretaceous and Jurassic rocks
    KJ1Cretaceous and upper Jurassic rocks
    KJ2lower Cretaceous and upper Jurassic rocks
    KJ3lower Cretaceous and upper Jurassic(?) rocks
    JJurassic rocks
    uJupper Jurassic rocks
    mJmiddle Jurassic rocks
    lJlower Jurassic rocks
    JPJurassic, Triassic, and Permian rocks
    JMJurassic to Mississippian rocks
    JTRJurassic and(or) Triassic rocks
    TRTriassic rocks
    uTRupper Triassic rocks
    TRPTriassic and Permian rocks
    TRDTriassic to Devonian rocks
    PPermian rocks
    PIPPermian and Pennsylvanian rocks
    IPPennsylvanian rocks
    IPMPennsylvanian and Mississippian rocks
    PzPaleozoic rocks
    uPzupper Paleozoic rocks
    lPzlower Paleozoic rocks
    MMississippian rocks
    MDMississippiaN and(or) Devonian rocks
    DDevonian rocks
    uDupper Devonian rocks
    umDupper and(or) middle Devonian rocks
    DSDevonian and Silurian rocks
    SSilurian rocks
    OOrdovician rocks
    SOSiluriaN and Ordovician rocks
    CCambrian rocks
    OpCOrdovician, Cambrian, and Precambrian rocks
    lPzpClower Paleozoic and(or) Precambrian rocks
    ZPrecambrian Z rocks
    Z1younger Precambrian Z rocks
    Z2older Precambrian Z rocks
    TpcPliocene continental deposits
    uTcupper Tertiary continental deposits
    TmcMiocene continental deposits
    mTcmiddle Tertiary continental deposits
    lTclower Tertiary continental deposits
    TxcPaleocene continental deposits
    TcTertiary continental deposits
    TKcTertiary and Cretaceous continental deposits
    uKcupper Cretaceous continental deposits
    lKclower Cretaceous continental deposits
    lJmlower Jurassic metamorphic rocks
    MzmMesozoic metamorphic rocks
    JPmJurassic, Triassic, and Permian metamorphic rocks
    PzmPaleozoic metamorphic rocks
    PzpCmPaleozoic and(or) Precambrian metamorphic rocks
    Entity_and_Attribute_Overview:
    Geologic unit descriptions from Beikman, H.M., 1980, Geologic map of Alaska: U.S. Geological Survey Special Map, scale 1:2,500,000, 2 sheets.
    Entity_and_Attribute_Detail_Citation: http://agdc.usgs.gov/data/usgs/geology/

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    S. J. Moll, Scott Bie, Devon Peterson, D. C. Pray, F.H. Wilson, J. M. Schmidt, J. R. Riehle, T.P. Miller
  3. To whom should users address questions about the data?
    U.S. Geological Survey Alaska Section, Mineral Resource Surveys Program, Geologic Division
    GIS Support Staff
    4200 University Dr.
    Anchorage, AK

    (907)-786-7495 (voice)

Why was the data set created?

This coverage is intended to provide digital features (polygons) representing generalized geologic units in Alaska for use in small-scale spatial anlysis (statewide) with other coverages such as vegetation types, soils, geochemical values etc.

How was the data set created?

  1. From what previous works were the data drawn?
    Beikman 1980 (source 1 of 1)
    U.S. Geological Survey, 1980, Geologic Map of Alaska: Special publication SG0002-1T and SG0002-2T, U.S. Government Printing Office, Washinton, D.C..

    Type_of_Source_Media: Paper Map
    Source_Scale_Denominator: 2500000
    Source_Contribution: Geologic units and attributes
  2. How were the data generated, processed, and modified?
    Date: 1997 (process 1 of 2)
    The linework was digitized from a paper copy of the 1980 map at the EROS Data Center in Sioux Falls, South Dakota, and the resulting coverage (ARC/INFO version 5) transferred to the EROS Alaska Field Office. Although the latitude/ longitude grid shown on the published Beikman map was an Albers equal area projection, the geologic polygons were not in the same projection since they did not align with an Albers equal area coverage of the Alaskan coastline. A rubber-sheeting operation was performed on the geologic polygons using points along the coastline and major rivers to match an Albers equal area projection. In 1997, this coverage was imported into ARC/INFO version 7.0.4, and edited by the Alaska Section, Geologic Divsion, USGS. Map unit (polygon)locations and attributes were checked by three reviewers, by comparing a printed copy of the coverage to the original map. Metadata were collected using document.aml v. 7.1.1, distributed by ESRI, Inc.
    Date: 22-May-2006 (process 2 of 2)
    Peter Schweitzer cleaned up the metadata, clarifying descriptions and fixing problems introduced by DOCUMENT.aml
  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 quality of the geology in the digital coverage is that of the original 1980 map. No recent data have been added. The geographic accuracy of the original published map has been slightly degraded by the rubber-sheet operation.
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    The following map features are not included in the digital representation: faults; locations of volcanoes and vents; explanation; and description of map units.
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present.

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 coverage should not be copied or distributed without its associated metadata file. Intended use is at small scales (e.g. statewide, 1:2,500,000 etc.) only; enlargements of this data to scales greater than that at which they were originally compiled can lead to misinterpretation of data. The U.S. Geological Survey should be acknowledged as the data source in products derived from these data. Use of these data is not restricted; however, organizations, agencies, units of government or other users are responsible for its appropriate application.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: webmaster - Alaska Geospatial Data Clearinghouse
    4230 University Drive
    Anchorage, AK

    Please use electronic mail. (voice)
    webmaster@www-eros-afo.wr.usgs.gov
    Contact_Instructions: Please use electronic mail.
  2. What's the catalog number I need to order this data set? BEIKMAN
  3. What legal disclaimers am I supposed to read?
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The U.S. Dept. of Interior, nor any of its agencies are liable for misuse of the data, nor for any damage, transmission of viruses or computer contamination caused through transmission of these data sets.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 07-Dec-2016
Metadata author:
Peter N Schweitzer
USGS Eastern Mineral and Environmental Resources Science Center
Geologist
12201 Sunrise Valley Drive
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/metadata/akgeo-beikman.faq.html>
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