Identification_Information:
  Citation:
    Citation_Information:
      Originator: Felger, T.J., Beard, L.S., Anderson, Z.W., Fleck, R.J., Wooden, J.L., and Seixas, G.B
      Publication_Date: 2014
      Title: Preliminary geologic map of Black Canyon and surrounding region, Nevada and Arizona
      Edition: Version 1.0
      Geospatial_Data_Presentation_Form: vector digital data (ArcGIS 10.1 Personal Geodatabase)
      Series_Information:
        Series_Name: U.S. Geological Survey Open-File Report
        Issue_Identification: 2013-1267-A
      Publication_Information:
        Publication_Place: Reston, Virginia
        Publisher: U.S. Geological Survey
      Online_Linkage: http://pubs.usgs.gov/of/2013/1267/a/
  Description:
    Abstract:
      This digital map database represents the general distribution of bedrock and surficial geologic units in the Black Canyon and surrounding regions of Nevada and Arizona. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey.

      Note: This metadata report provides an overview of the data content of this ESRI ArcGIS 10.1 personal geodatabase. For more information about the contents of the geodatabase, refer to the Supplemental Information section of this metadata report. In addition, each feature class (except annotation) has a corresponding metadata report that contains detailed Data Quality and Entity Attribute information.
    Purpose: This geologic map was compiled for a study of the geologic framework of springs and seeps that discharge in Black Canyon directly south of Lake Mead below Hoover Dam, Nevada and Arizona. The hydrogeologic and geochemical study of the Black Canyon thermal springs by the U.S. Geological Survey was funded by the National Park Service and National Cooperative Geologic Mapping Program of the U.S. Geological Survey. The study consisted of (1) compilation of existing geologic mapping, augmented by new field geologic mapping and geochronology (this report), and (2) collection and analysis of structural data adjacent to the springs of interest, and the construction of regional cross sections (presented in Geologic Framework of Thermal Springs, Black Canyon, Nevada and Arizona, U.S. Geological Survey Open-File Report 2013-1267-B, http://pubs.usgs.gov/of/2013/1267/b/).
    Supplemental_Information:
      This geodatabase contains the following:

      Feature dataset GeologicMap - includes the following feature classes used to depict the geology:
      Attitudes (Attitudes)
      AttitudesAnno (annotation linked to Attitudes via relationship class AttitudesToAnno)
      ContactsAndFaults (geologic contacts and faults)
      MapUnitPoints (geologic unit label points)
      MapUnitPointsAnno (annotation linked to MapUnitPoints via relationship class MapUnitPointsToAnno)
      MapUnitPolys (geologic unit polygons)
      OrientationPoints (cartographic symbols)

      Feature dataset CMULMUExp - includes the following feature classes used to depict the Correlation of Map Units and List of Map Units for the geologic map:
      CMULMUExp_anno (geologic unit names, ages, and other descriptive text)
      CMULMUExp_arc (age brackets)
      CMULMUExp_poly (geologic unit polygons)
      CMULMUExp_polyAnno (annotation linked to CMULMUExp_poly via relationship class CMULMUExp_polyToAnno)

      Feature class Boundary depicts the map boundary, and feature class MapIndex depicts the source geologic maps used in the compilation (refer to Source Data in the Lineage section of the metadata for detailed information).

      Style file BlackCanyonSpgGeoMap48kOF2013-1267-A.style contains the ArcMap symbols used to create the cartographic depiction of the data. 
  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2013
    Currentness_Reference: publication date
  Status:
    Progress: In work
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -115.006091
      East_Bounding_Coordinate: -114.559896
      North_Bounding_Coordinate: 36.136187
      South_Bounding_Coordinate: 35.742213
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: geologic map
      Theme_Keyword: geoscientific information 
    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: Black Canyon
      Place_Keyword: Hoover Dam
      Place_Keyword: Lake Mead
      Place_Keyword: Lake Mead National Recreation Area
      Place_Keyword: Mohave County
      Place_Keyword: Clark County
      Place_Keyword: Nevada
      Place_Keyword: Arizona
  Access_Constraints: None
  Use_Constraints: Not for use at scales larger than 1:48,000. Any derivative products utilizing these datasets shall clearly indicate their source. If users modify the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these datasets, nor to imply that changes they made were approved by the U.S. Geological Survey.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Tracey J. Felger
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 2255 N. Gemini Dr.
        City: Flagstaff
        State_or_Province: AZ
        Postal_Code: 86001
        Country: USA
      Contact_Voice_Telephone: 928-556-7348
      Contact_Facsimile_Telephone: 928-556-7169
      Contact_Electronic_Mail_Address: tfelger@usgs.gov
  Data_Set_Credit: This digital database was prepared by Tracey Felger. Technical reviews were provided by Ernie Anderson and Ric Page of the U.S. Geological Survey. Digital review was provided by Sue Priest of the U.S. Geological Survey.  Editorial review was provided by J.L. Zigler of the U.S. Geological Survey.
  Native_Data_Set_Environment: ESRI ArcGIS 10.1, Personal Geodatabase
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Geologic features in the geodatabase were symbolized based on attributes, plotted at 1:48,000-scale and visually reviewed for accuracy by the authors.
  Logical_Consistency_Report: Topology was validated and errors were fixed or flagged as exceptions. Additionally, feature class MapUnitPolys was checked for sliver polygons by searching for anomalously small values in the Shape_Area field. Feature class ContactsAndFaults was checked to ensure the length and directionality of each line segment was appropriate for the geologic feature it depicts.
  Completeness_Report: This geodatabase is considered complete. All geologic features on the source maps were digitized and atrributed.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Most of the database was compiled from source maps ranging in scale from 1:24,000 to 1:62,500 (see feature class MapIndex for details). Lines in feature class ContactsAndFaults with the modifier 'certain' in the Type field (e.g. contact_certain) are assumed (but not guaranteed) to be located within approximately +/- 30 meters of their actual position on the ground, while lines with modifiers 'approximate', inferred', and 'concealed' are assumed to be poorly located, and may have errors that greatly exceed +/- 30 meters. All points in feature class Attitudes are assumed (but not guaranteed) to be located within approximately +/- 30 meters of their actual position on the ground. Points in feature classes MapUnitPoints and OrientationPoints are for cartographic purposes only, and have no specific spatial relevance.
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Anderson, R.E.
          Publication_Date: 1977
          Title: Geologic map of the Boulder City 15-minute quadrangle, Mohave County, Arizona and Clark County, Nevada
          Series_Information:
            Series_Name: U.S. Geological Survey Geologic Quadrangle Map
            Issue_Identification: GQ-1395
          Publication_Information:
            Publication_Place: Reston, Virginia
            Publisher: U.S. Geological Survey
      Source_Scale_Denominator: 62,500
      Type_of_Source_Media: Paper map
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1977
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Anderson (1977)
      Source_Contribution: Geologic mapping
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Anderson, R.E.
          Publication_Date: 1978
          Title: Geologic map of the Black Canyon 15-minute quadrangle, Mohave County, Arizona and Clark County, Nevada
          Series_Information:
            Series_Name: U.S. Geological Survey Geologic Quadrangle Map
            Issue_Identification: GQ-1394
          Publication_Information:
            Publication_Place: Reston, Virginia
            Publisher: U.S. Geological Survey
      Source_Scale_Denominator: 62,500
      Type_of_Source_Media: Paper map
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1978
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Anderson (1978)
      Source_Contribution: Geologic mapping
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Beard, L.S., Anderson, R.E., Block, D.L., Bohannon, R.G., Brady, F.J., Castor, S.B., Duebendorfer, D.M., Faulds, J.E., Felger, T.J., Howard, K.A., Kuntz, M.A., and Williams, V.S.
          Publication_Date: 2007
          Title: Preliminary geologic map of the Lake Mead 30' X 60' Quadrangle, Clark, County, Nevada, and Mohave County, Arizona
          Series_Information:
            Series_Name: U.S. Geological Survey Open-File Report
            Issue_Identification: Open-File Report 2007-1010
          Publication_Information:
            Publication_Place: Flagstaff, AZ
            Publisher: U.S. Geological Survey
          Online_Linkage: http://pubs.usgs.gov/of/2007/1010/
      Source_Scale_Denominator: 100,000
      Type_of_Source_Media: Digital data
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2007
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Beard and others (2007)
      Source_Contribution: Geologic mapping
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Bell, J.W., and Smith, E.I.
          Publication_Date: 1980
          Title: Geologic map of the Henderson quadrangle, Nevada
          Series_Information:
            Series_Name: Nevada Bureau of Mines and Geology Map
            Issue_Identification: Map 67
          Publication_Information:
            Publication_Place: Nevada
            Publisher: Nevada Bureau of Mines and Geology
          Online_Linkage: http://www.nbmg.unr.edu/dox/dox.htm#3
      Source_Scale_Denominator: 24,000
      Type_of_Source_Media: Paper map
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1980
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Bell and Smith (1980)
      Source_Contribution: Geologic mapping
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Ekren, E.B., and Anderson, R.E.
          Publication_Date: 1996
          Title: Preliminary geologic map of the Boulder City 7 ½-minute quadrangle, Clark County, Nevada
          Series_Information:
            Series_Name: Las Vegas Valley Water District report
            Issue_Identification: no identifier
          Publication_Information:
            Publication_Place: Las Vegas, Nevada
            Publisher: Las Vegas Valley Water District
      Source_Scale_Denominator: 24,000
      Type_of_Source_Media: Paper map
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1996
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Ekren, E.B., and Anderson, R.E. (1996)
      Source_Contribution: Geologic mapping
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Mills, J.G.
          Publication_Date: 1994
          Title: Geologic Map of the Hoover Dam Quadrangle, Arizona and Nevada
          Series_Information:
            Series_Name: Nevada Bureau of Mines and Geology Map
            Issue_Identification: Map 102
          Publication_Information:
            Publication_Place: Nevada
            Publisher: Nevada Bureau of Mines and Geology
          Online_Linkage: http://www.nbmg.unr.edu/dox/dox.htm#3
      Source_Scale_Denominator: 24,000
      Type_of_Source_Media: Paper map
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1994
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Mills (1994)
      Source_Contribution: Geologic mapping
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Smith, E.I.
          Publication_Date: 1984
          Title: Geologic map of the Boulder Beach quadrangle, Nevada
          Series_Information:
            Series_Name: Nevada Bureau of Mines and Geology Map
            Issue_Identification: Map 81
          Publication_Information:
            Publication_Place: Nevada
            Publisher: Nevada Bureau of Mines and Geology
          Online_Linkage: http://www.nbmg.unr.edu/dox/dox.htm#3
      Source_Scale_Denominator: 24,000
      Type_of_Source_Media: Paper map
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 1984
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Smith (1984)
      Source_Contribution: Geologic map
    Process_Step:
      Process_Description:
        This geodatabase was compiled primarily from the source geologic maps described in the Source Data section below, and depicted in feature class MapIndex.  The compilation was augmented by new field geologic mapping and geochronology data.

        Hardcopy source geologic maps were scanned and georeferenced to 1:24,000-scale DRG's using a first-order polynomial transformation. Geologic features were then heads-up digitized to produce a digital compilation of each source map in geodatabase format. The individual geodatabases were merged into a single database that was clipped to the study area boundary. Editing was performed as needed to update the geology in areas where new geologic mapping had taken place, and to generalize areas of more detailed mapping so that the data resolution througout the database was appropriate for display at 1:48,000-scale. Geologic unit polygons (MapUnitPolys) were generated by the FeatureToPolygon command, with ContactsAndFaults as input features, and MapUnitPoints as label features.
      Process_Date: 2009-2013
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Person: Tracey J. Felger
            Contact_Organization: U.S. Geological Survey
          Contact_Position: Geologist/GIS Specialist
          Contact_Address:
            Address_Type: mailing and physical address
            Address: 2255 N. Gemini Dr.
            City: Flagstaff
            State_or_Province: AZ
            Postal_Code: 86001
            Country: USA
          Contact_Voice_Telephone: 928-556-7348
          Contact_Facsimile_Telephone: 928-556-7169
          Contact_Electronic_Mail_Address: tfelger@usgs.gov
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: Universal Transverse Mercator
        Universal_Transverse_Mercator:
          UTM_Zone_Number: 11
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.999600
            Longitude_of_Central_Meridian: -117.000000
            Latitude_of_Projection_Origin: 0.000000
            False_Easting: 500000.000000
            False_Northing: 0.000000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 0.000128
          Ordinate_Resolution: 0.000128
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: GRS_1980
      Semi-major_Axis:  6378137.0
      Denominator_of_Flattening_Ratio: 298.257222101
  Vertical_Coordinate_System_Definition:
    Altitude_System_Definition:
      Altitude_Resolution: 0.000010
      Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview: Each feature class (except annotation) has a corresponding metadata report that contains detailed Entity Attribute information. These reports can be accessed through the 'Description' tab in ArcCatalog.
    Entity_and_Attribute_Detail_Citation: Not applicable.
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey Information Services
      Contact_Address:
        Address_Type: mailing address
        Address: Box 25286 Denver Federal Center
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 1-888-ASK-USGS
      Contact_Electronic_Mail_Address: ask@usgs.gov
  Resource_Description: Downloadable Data
  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.

    In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of delivery, installation, operation, or support by USGS.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ArcGIS Personal Geodatabase
        Format_Version_Number: 10.1
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/of/2013/1267/a/
    Fees: None
Metadata_Reference_Information:
  Metadata_Date: 20130809
  Metadata_Review_Date: 20120914
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Tracey J. Felger
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Geologist/GIS Specialist
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 2255 N. Gemini Dr.
        City: Flagstaff
        State_or_Province: AZ
        Postal_Code: 86001
        Country: USA
      Contact_Voice_Telephone: 928-556-7348
      Contact_Facsimile_Telephone: 928-556-7169
      Contact_Electronic_Mail_Address: tfelger@usgs.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Extensions:
    Online_Linkage: http://www.esri.com/metadata/esriprof80.html
    Profile_Name: ESRI Metadata Profile