Identification_Information:
  Citation:
    Citation_Information:
      Originator: P.K. Sims
      Originator: Karen Lund
      Originator: E. Anderson
      Publication_Date: 2005
      Title: Precambrian crystalline basement map of Idaho--An interpretation of 
        aeromagnetic anomalies
      Edition: version 1.0
      Geospatial_Data_Presentation_Form: map
      Series_Information:
        Series_Name: USGS Scientific Investigations Map
        Issue_Identification: Scientific Investigations Map 2884
      Publication_Information:
        Publication_Place: Denver, Colorado, U.S.A.
        Publisher: United States Geological Survey
      Online_Linkage: http://pubs.usgs.gov/sim/2005/2884

  Description:
    Abstract:
      Idaho lies within the northern sector of the U.S. Cordillera astride the 
        boundary between the Proterozoic continent (Laurentia) to the east and 
        the Permian to Jurassic accreted terranes to the west.  The continental 
        basement is mostly covered by relatively undeformed Mesoproterozoic 
        metasedimentary rocks and intruded or covered by Phanerozoic igneous 
        rocks; accordingly, knowledge of the basement geology is poorly 
        constrained.  Incremental knowledge gained since the pioneering studies 
        by W. Lindgren, C.P. Ross, A.L. Anderson, A. Hietanen, and others during 
        the early- and mid-1900's has greatly advanced our understanding of the 
        general geology of Idaho.  However, knowledge of the basement geology 
        remains relatively poor, partly because of the remoteness of much of the 
        region plus the lack of a stimulus to decipher the complex assemblage of 
        high-grade gneisses and migmatite of central Idaho.  The availability of 
        an updated aeromagnetic anomaly map of Idaho (North American Magnetic 
        Anomaly Group, 2002) provides a means to determine the regional 
        Precambrian geologic framework of the State.  The combined geologic and 
        aeromagnetic data permit identification of previously unrecognized 
        crystalline basement terranes, assigned to Archean and Paleoproterozoic 
        ages, and the delineation of major shear zones, which are expressed in 
        the aeromagnetic data as linear negative anomalies (Finn and Sims, 
        2004).  Limited geochronologic data on exposed crystalline basement 
        aided by isotopic studies of zircon inheritance, particularly Bickford 
        and others (1981) and Mueller and others (1995), provide much of the 
        geologic background for our interpretation of the basement geology.  In 
        northwestern United States, inhomogeneities in the basement inherited 
        from Precambrian tectogenesis controlled many large-scale tectonic 
        features that developed during the Phanerozoic.  Two basement 
        structures, in particular, provided zones of weakness that were 
        repeatedly rejuvenated:  (1) northeast-trending ductile shear zones 
        developed on the northwest margin of the Archean Wyoming province during 
        the Paleoproterozoic Trans-Montana orogeny (Sims and others, 2004), and 
        (2) northwest-trending intra-continental faults of the Mesoproterozoic 
        Trans-Rocky Mountain strike-slip fault system (Sims, unpub. data, 2003).  
        In this report, geologic ages are reported in millions of years (Ma) and 
        generalized ages are given in billions of years (Ga).  The subdivision 
        of Precambrian rocks used herein is the time classification recommended 
        by the International Union of Geological Sciences (Plumb, 1991).
    Purpose:
      This ARC/INFO dataset was developed to provide a geologic map GIS database
      of the Precambrian basement of Idaho for use in spatial analysis by a 
      variety of users.
    Supplemental_Information:
      Shapefiles included in this geospatial database:
      id_contacts: line shapefile of geologic contacts
      id_faults: line shapefile of geologic faults
      id_rocks: polygon shapefile of geologic units

  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2005
    Currentness_Reference: publication date

  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: none currently planned

  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -117.487884
      East_Bounding_Coordinate: -110.703864
      North_Bounding_Coordinate: 49.033439
      South_Bounding_Coordinate: 41.949861

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: American Geological Institute Glossary of 
        Geology
      Theme_Keyword: aeromagnetic anomalies
      Theme_Keyword: Archean
      Theme_Keyword: basement
      Theme_Keyword: batholiths
      Theme_Keyword: intrusions
      Theme_Keyword: mapping
      Theme_Keyword: tectonics
    Place:
      Place_Keyword_Thesaurus: Board of Geographic Names
      Place_Keyword: Idaho
      Place_Keyword: Snake River
      Place_Keyword: Salmon River
      Place_Keyword: Rocky Mountains

  Access_Constraints: None

  Use_Constraints: None.  Acknowledgment of the U.S. Geological Survey would 
    be appreciated in products derived from these data.

  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Eric Anderson
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: MS 964, Box 25046 DFC
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225-0046
        Country: USA
      Contact_Voice_Telephone: 303-236-5652
      Contact_Facsimile_Telephone: 303-236-1425
      Contact_Electronic_Mail_Address: ericanderson@usgs.gov

  Browse_Graphic:
    Browse_Graphic_File_Name: 
      http://pubs.usgs.gov/sim/2884/2884.pdf
    Browse_Graphic_File_Description: graphic representation of map layout
    Browse_Graphic_File_Type: PDF

  Data_Set_Credit: Eric Anderson, U.S. Geological Survey, served as GIS 
    coordinator in the creation of the GIS database.  Alex J. Donatich, U.S. 
    Geological Survey, assisted in proofing the geology and correcting the GIS 
    database.

  Native_Data_Set_Environment:
    Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1
    ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: 
      The database consists of newly generated data that were compiled on mylar 
      and then digitized in ARC/INFO.  This map was thoroughly reviewed for 
      conformity with U.S. Geological Survey editorial standards and 
      stratigraphic nomenclature.

  Logical_Consistency_Report: 
    Map elements were visually checked by the authors and editor for overshoots, 
    undershoots, duplicate features, polygon attributes, and other errors.  
    Automated (ARC/INFO) routines were also used to check the databases for 
    polygon label errors and dangling arcs.  The coverages were cleaned in 
    ARC/INFO to ensure logical consistency that is topologically clean.  The map 
    was reviewed by other geologists for consistency with basic geologic 
    principles and general conformity to USGS mapping standards.

  Completeness_Report: 
    This dataset is complete and includes the spatial coverages pertaining to 
    the geologic map.

  Lineage:
    Process_Step:
      Process_Description: Paul Sims compiled the geology.  Eric Anderson 
        digitized the geology.  The digital database was quality checked by Alex 
        J. Donatich.  The layout of the finished paper map was prepared by Alex 
        J. Donatich and checked by Paul Sims and Karen Lund.
      Process_Date: 2004-2005

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Map_Projection:
        Map_Projection_Name: Lambert Conformal Conic
        Lambert_Conformal_Conic:
          Standard_Parallel: 33.000000
          Standard_Parallel: 45.000000
          Longitude_of_Central_Meridian: -114.000000
          Latitude_of_Projection_Origin: 39.000000
          False_Easting: 0.000000
          False_Northing: 0.000000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 0.002048
          Ordinate_Resolution: 0.002048
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 80
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      The data are supplied in ArcView shapefile format.

      >Attribution of user-defined item ARC_TYPE in id_contacts.aat:
      >contact coincident with fault
      >contact, certain
      >contact, uncertain
      >map boundary

      >Attribution of user-defined item FAULT_TYPE in id_faults.aat:
      >strike-slip fault, certain
      >strike-slip fault, inferred
      >thrust fault, certain
      >thrust fault, inferred

      >Attribution of user-defined item UNIT in id_rocks.pat:
      >Aggn
      >Agn
      >Ap
      >Apg
      >JP
      >PzY
      >XAg
      >XAr
      >Xa
      >Xw
      >Xwv

    Entity_and_Attribute_Detail_Citation: none

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: Central Publications Group
        Address: MS 902, Box 25046
        Address: Denver Federal Center
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: (888)ASK-USGS
      Contact_Electronic_Mail_Address: webmaster@geology.cr.usgs.gov

  Distribution_Liability: 
    The U.S. Geological Survey (USGS) provides these geographic data "as is".  
    The USGS makes no guarantee or warranty concerning the accuracy of 
    information contained in the geographic data.  The USGS further makes no 
    warranties, either expressed or implied, as to any other matter whatsoever, 
    including, without limitation, the condition of the product, or its fitness 
    for any particular purpose.  The burden for determining fitness for use lies 
    entirely with the user.  Although these data have been processed 
    successfully on computers at the USGS, no warranty, expressed or implied, is 
    made by the USGS regarding the use of these data on any other system, nor 
    does the fact of distribution constitute or imply any such warranty.

  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ArcView shapefile formats
        Format_Version_Number: ArcInfo version 9.0
        File_Decompression_Technique:
          .tar.gz - UNIX gzip-compressed TAR file - use GNU zip and TAR to 
          extract
          .ZIP - Windows ZIP archive - use Winzip, PKZip, or similar to extract
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: <http://pubs.usgs.gov/sim/2005/2884/>
    Fees: None

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S.Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: USGS Information Services
        Address: Box 25286
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225
        Country: United States
      Contact_Voice_Telephone: 1-888-ASK-USGS
  Resource_Description: Scientific Investigations Map 2884 (plot-on-demand)
  Distribution_Liability: none

  Standard_Order_Process:
    Non-digital_Form: 
      Available as one printed sheet.  Order from USGS at the address listed 
      above or see <http://rmmcweb.cr.usgs.gov/pub/mod/order.html/> for more 
      ordering information.
    Fees:
      For current prices please see
      <http://rmmcweb.cr.usgs.gov/public/mod/order.html/>

Metadata_Reference_Information:
  Metadata_Date: 20050418
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Eric Anderson
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: Denver Federal Center, MS 964
        Address: Box 25046
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: (303) 236-5652
      Contact_Electronic_Mail_Address: ericanderson@usgs.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Access_Constraints: None
  Metadata_Use_Constraints: None