Identification_Information:


  Citation:


    Citation_Information:


      Originator: G.A. Phelps and E.H. Mckee


      Publication_Date: 1999


      Title:


        High-angle faults in the basement of Yucca Flat, Nevada Test Site, Nevada,


        based on analysis of a constrained gravity inversion surface


      Edition: rev 1.0


      Publication_Information:


        Publication_Place: U.S. Geological Survey, Menlo Park, CA


        Publisher: U.S. Geological Survey


      Online_Linkage: http://wrgis.wr.usgs.gov/open-file/of99-383


  Description:


    Abstract: Using a model of the topographic subsurface derived from drill hole and gravity inversion analysis of the basement rocks in Yucca Flat, Nevada Test Site (NTS), Nevada, a fault map was constructed based on offsets of the basement surface.  Because these faults are, in large part, not present at the surface, they are interpreted to be inactive faults, older than the alluvial basin fill.


    Purpose: To provide basic geolgic information to regional groundwater flow studies


  Point_of_Contact:


    Contact_Information:


      Contact_Person_Primary:


        Contact_Person: Geoffrey Phelps


        Contact_Organization: U.S. Geological Survey


      Contact_Address:


        Address: 345 Middlefield Rd. MS 989


        City: Menlo Park


        State_or_Province: CA


        Postal_Code: 94025


        Country: USA


        Address_Type: mailing and physical address


      Contact_Voice_Telephone: 650-329-4922


  Spatial_Domain:


    Bounding_Coordinates:


      West_Bounding_Coordinate: 575467


      East_Bounding_Coordinate: 591598


      North_Bounding_Coordinate: 4120088


      South_Bounding_Coordinate: 4087292


  Native_Data_Set_Environment:


    data was stored and analysed using Arc/Info version 7.1.2 on a SUN Ultra4000


    UNIX platform


  Status:


    Progress: Preliminary report


    Maintenance_and_Update_Frequency: none planned


  Keywords:


    Place:


      Place_Keyword: Yucca Flat, NTS, Nevada Test Site, Environmental Restoration Program


    Theme:


      Theme_Keyword: gravity, basement, gravity inversion, basement density


  Access_Constraints: none


  Use_Constraints: none


Data_Quality_Information:


  Attribute_Accuracy:


    Attribute_Accuracy_Report:


      Accuracy of the linear features in this report is roughly 200m, as estimated


      visually by the authors, based on the 200m resolution of the parent dataset


      from which the linear features were derived.


  Logical_Consistency_Report: see open-file report


  Completeness_Report:


    interpretive dataset based on geologic and geophysical analysis.  see


    open-file report.


  Lineage:


    Source_Information:


      Source_Citation:


        Citation_Information:


          Originator: Phelps, G.A., Langenheim, V.E., and Jachens, R.C.


          Publication_Date: 1999


          Title:


            Thickness of Cenozoic deposits of Yucca Flat inferred from gravity data,


            Nevada Test Site, Nevada


          Series_Information:


            Series_Name: U.S. Geological Survey Open-file Report 99-310


          Edition: first edition


Spatial_Reference_Information:


  Horizontal_Coordinate_System_Definition:


    Geodetic_Model:


      Horizontal_Datum_Name:


        UTM


        zone 11


        NAD27


      Ellipsoid_Name: CLARKE 1866


Entity_and_Attribute_Information:


  Detailed_Description:


    Entity_Type:


      Entity_Type_Definition: Point_and_Vector_Object_Type


      Entity_Type_Label: vector line data; K-cell = 1


    Attribute:


      Attribute_Definition:


        ID_NUMBER greater than 100


        approximately located normal fault


      Attribute_Definition:


        ID_NUMBER less than 100


        well located fault


      Attribute_Label: geologic line type


      Attribute_Domain_Values:


        Codeset_Domain:


          Codeset_Name:


            normal fault, approximately located


            normal fault, certain


  Overview_Description:


    Entity_and_Attribute_Overview:


      The data file is in ASCII format.  The data define a series of vectors, coded


      as follows:


      ID_NUMBER


      X_COORDINATE, Y_COORDINATE


      X_COORDINATE, Y_COORDINATE


      ...


      END





      The ID_NUMBER is unique to each vector, and the vertices of the vector are


      defined by the x-y coordinate pairs which follow on subsequent lines.  The


      end of the vector is indicated by the keyword END





      Attribute information is coded into both the ID_NUMBER and the direction of


      the vector.  There are two types of attributes represented: certain faults,


      coded with an ID_NUMBER less than 100, and approximately located faults, coded


      with an ID_NUMBER greater than 100.  All faults are normal faults, with the


      down-dropped block to the right of the vector as one faces along the direction


      of the vector.


  Overview_Description:


    Entity_and_Attribute_Overview:


      vector line objects representing two types of linear entities:


      certain normal faults and approximately located normal faults


Metadata_Reference_Information:


  Metadata_Date: 19990716


  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadta