Identification_Information:
  Citation:
    Citation_Information:
      Originator: U.S. Geological Survey
      Publication_Date: 2009
      Title:
        Geophysical Interpretations of the Southern 
        Espaņola Basin, New Mexico, that Contribute 
        to Understanding its Hydrogeologic Framework
      Geospatial_Data_Presentation_Form: Arc Shapefiles
      Series_Information:
        Series_Name: U.S. Geological Survey Professional Paper
        Issue_Identification: Professional Paper 1761
      Publication_Information:
        Publication_Place: Denver, Colorado, USA
        Publisher: U.S. Geological Survey      
Description:
  Abstract:
    The digital data of this report depict geologic 
    features and models interpreted from geophysical 
    data for the Southern Espaņola Basin, New Mexico.

    The southern Espaņola basin consists of a westward- and
    northward-thickening wedge of rift fill, composed
    primarily of Santa Fe Group sediments, that serves as
    an important aquifer for the city of Santa Fe and
    surrounding areas.  Detailed aeromagnetic surveys were
    flown to better understand ground-water resources in
    this aquifer.  This report presents a synthesis of these
    data with gravity data and other constraints.  The
    interpretations were accomplished using qualitative
    interpretation, quantitative data analysis, and two- 
    and three-dimensional modeling.  The results depict the 
    presence of and depth to many geologic features that have 
    hydrogeologic significance, including shallow faults, 
    different types of igneous units, base of Santa Fe Group,
    and basement rocks.  The report presents map
    interpretations, geophysical profile models, and a
    digital surface that represents the base and thickness
    of Santa Fe Group sediments, as well as vector files
    of some volcanic features and faults. 
Purpose:
    The objectives of the geophysical interpretations are 
    to characterize and image basin elements that are 
    important for understanding the hydrogeologic framework, 
    especially where those elements are concealed below 
    the ground. 
Time_Period_of_Content:
  Time_Period_Information:
    Range_of_Dates/Times:
      Beginning_Date: 1997
      Ending_Date: 2008
  Currentness_Reference: publication date
Status:
  Progress: complete
  Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
  Bounding_Coordinates:
    West_Bounding_Coordinate: -106.3 degrees W. longitude
    East_Bounding_Coordinate: -105.8 degrees W. longitude
    North_Bounding_Coordinate: 36.1 degrees N. latitude
    South_Bounding_Coordinate: 35.3 degrees N. latitude
Keywords:
  Place:
    Place_Keyword_Thesaurus: none
    Place_Keyword: United States
    Place_Keyword: New Mexico
    Place_Keyword: Espaņola Basin
  Theme:
    Theme_Keyword_Thesaurus: none
    Theme_Keyword: aeromagnetic data
    Theme_Keyword: geophysical data
    Theme_Keyword: geophysical model

Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
  Contact_Information:
    Contact_Person_Primary:
      Contact_Person: V.J.S. Grauch
      Contact_Organization: U.S. Geological Survey
    Contact_Address:
      Address_Type: mailing address
      Address:
        Box 25046, MS964
        Denver Federal Center
      City: Denver
      State_or_Province: CO
      Postal_Code: 80225-0046
      Country: USA
    Contact_Voice_Telephone: 303-236-1393
    Contact_Electronic_Mail_Address: tien@usgs.gov
Data_Set_Credit:
  V.J.S. Grauch  (USGS)
  Jeffrey D. Phillips (USGS)
  Daniel J. Koning (New Mexico Bureau of Geology and Mineral Resources)
  Peggy S. Johnson (New Mexico Bureau of Geology and Mineral Resources)
  Viki Bankey (USGS)
Native_Data_Set_Environment:
  Microsoft Windows XP Professional 5.1.2600
  Earth Resource Mapping ER Mapper v. 7.1
  Geosoft Oasis montaj v 7.0.1 (OL)
  USGS potential-field geophysical software (U.S. Geological Survey
    Open-file reports 97-025 and 2007-1355 and unpublished programs
    by J.D. Phillips, 2008)
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      The data in the original grids have been processed using formulas
      and methods that are not usually documented but that represent
      industry standard practices.
  Logical_Consistency_Report:
    Survey contracts specified the conditions and specifications under
    which data were collected.  Standard industry practices of
    the time were followed in data collection and processing.
  Completeness_Report: Survey is complete for the area covered.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
        These data are based on modelled criteria.  The
        horizontal position, therefore, is only as accurate
        as the underlying presumptions of physical properties
        on which they are based.
      The data are a modelled interpretation that is based on
      various original data that are described more fully in
      the original report.
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report:
        These data are based on modelled criteria.  The
        horizontal position, therefore, is only as accurate
        as the underlying presumptions of physical properties
        on which they are based.
  Lineage:
    Process_Step:
      Process_Description:
        Characterizing and imaging each of the basin
        elements using geophysical interpretation requires
        a different approach for each.  The final interpretations
        take the form of lines on a map (map interpretations) and
        digital surfaces derived from three-dimensional (3D)
        integrated modeling.  This complex process is described in
        full in the report.
      Process_Date: 2008
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: vector
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Map_Projection:
        Map_Projection_Name: Universal Transverse Mercator
        Transverse_Mercator:
          Scale_Factor_at_Central_Meridian: 0.9996
          Longitude_of_Central_Meridian: -105.0
          Latitude_of_Projection_Origin: 0.0
          False_Easting: 500,000 m
          False_Northing: 0
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1927
      Ellipsoid_Name: Clarke 1866
      Semi-major_Axis: 6371204.0
      Denominator_of_Flattening_Ratio: 0.926
Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      Files are in shapefile format, which consists
      of several associated files having the same prefix and
      various suffixes.  Together, these files form a vector 
      coverage.

      Suffixes:
      .dbf  (database file)
      .prj  (projection file)
      .shp  (shape definition file)
      .shx  (shape entities)

      Coverages:

      seb_intrusions.*** - Vector file of polygons outlining 
      interpreted extents of Tertiary older volcanic vents 
      and intrusions.  Includes bodies inferred to be associated 
      with the Cerrillos intrusion and the Espinaso Formation.

      seb_no_tov.*** - Vector file of polygons outlining areas 
      interpreted to be devoid of Tertiary older volcanic rocks 
      underneath  Santa Fe Group sediments.

      seb_grv_flts.*** - Vector file of lines representing faults 
      interpreted from gravity data.

      seb_cdr_extent.*** - Vector file of lines and polygons 
      representing magnetically inferred extent of Cerros del 
      Rio volcanic field and related flows within the study area.

      rv_hinge.*** - Vector file of line following general 
      location of interpreted Rancho Viejo hinge zone.

      seb_mag_flts.*** - Vector file of lines representing faults 
      interpreted from magnetic data.  Extracted for the study area 
      from digital files (crgrmag_faults1.0.*) of Grauch and Hudson 
      (2007).
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: USGS Information Services
      Contact_Address:
        Address_Type: mailing address
        Address:
          Box 25286, Building 810
          Denver Federal Center
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-202-4700
      Contact_Electronic_Mail_Address: www.usgs.gov/pubprod
  Resource_Description: USGS Professional Paper XXXX
  Distribution_Liability:
    Although all data published in these files have been used by the
    USGS, no warranty, expressed or implied, is made by the USGS as
    to the accuracy of the data and related materials.  The act of
    distribution shall not constitute any such warranty, and no
    responsibility is assumed by the USGS in the use of these data
    or related materials.

    Any use of trade, product, or firm names is for descriptive purposes
    only and does not imply endorsement by the U.S. Government.
Metadata_Reference_Information:
  Metadata_Date: 20081230
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Viki Bankey
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address:
          U.S. Geological Survey
          Box 25046 Mail Stop 964
          Denver Federal Center
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-236-1348
      Contact_Electronic_Mail_Address: viki@usgs.gov
  Metadata_Standard_Name:
    FGDC Content Standards for
    Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998