Identification_Information:
  Citation:
    Citation_Information:
      Originator: Donald E. Trimble
      Originator: Michael N. Machette
      Publication_Date: 1979
      Title: Geologic map of the greater Denver area, Front Range Urban 
        Corridor, Colorado 
      Edition: version 1.1
      Geospatial_Data_Presentation_Form: map
      Series_Information:
        Series_Name: USGS Miscellaneous Investigations Series
        Issue_Identification: I-856-H
      Publication_Information:
        Publication_Place: Denver, Colorado, U.S.A.
        Publisher: United States Geological Survey
      Online_Linkage: http://pubs.usgs.gov/imap/2004/i-856-h/
  Cross_Reference:
    Citation_Information:
      Originator: Theodore R. Brandt
      Originator: David W. Moore
      Originator: Kyle E. Murray
      Publication_Date: 2003
      Title: A Spatial Database of Bedding Attitudes to accompany Geologic Map 
        of the greater Denver area, Front Range urban corridor, Colorado, by 
        Donald E. Trimble and Michael N. Machette
      Edition: version 1.0
      Geospatial_Data_Presentation_Form: map
      Series_Information:
        Series_Name: USGS Open-File-Report
        Issue_Identification: ofr-03-025
      Publication_Information:
        Publication_Place: Denver, Colorado, U.S.A.
        Publisher: United States Geological Survey
      Online_Linkage: http://pubs.usgs.gov/of/2003/ofr-03-025
  Description:
    Abstract:
      This digital map shows the areal extent of surficial deposits and rock 
        stratigraphic units (formations) as compiled by Trimble and Machette 
        from 1973 to 1977 and published in 1979 under the Front Range Urban 
        Corridor Geology Program.  Trimble and Machette compiled their 
        geologic map from published geologic maps and unpublished geologic 
        mapping having varied map unit schemes.  A convenient feature of the 
        compiled map is its uniform classification of geologic units that 
        mostly matches those of companion maps to the north (USGS I-855-G) and 
        to the south (USGS I-857-F).  Published as a color paper map, the 
        Trimble and Machette map was intended for land-use planning in the 
        Front Range Urban Corridor.  This map recently (1997-1999) was 
        digitized under the USGS Front Range Infrastructure Resources Project.
      In general, the mountainous areas in the western part of the map exhibit 
        various igneous and metamorphic bedrock units of Precambrian age, 
        major faults, and fault brecciation zones at the east margin (5-20 km 
        wide) of the Front Range.  The eastern and central parts of the map 
        (Colorado Piedmont) depict a mantle of unconsolidated deposits of 
        Quaternary age and interspersed outcroppings of Cretaceous or 
        Tertiary-Cretaceous sedimentary bedrock.  The Quaternary mantle 
        comprises eolian deposits (quartz sand and silt), alluvium (gravel, 
        sand, and silt of variable composition), colluvium, and a few 
        landslides.  At the mountain front, north-trending, dipping Paleozoic 
        and Mesozoic sandstone, shale, and limestone bedrock formations form 
        hogbacks and intervening valleys.
    Purpose:
      This digital map can serve various purposes related to land-use planning 
        in the greater Denver metropolitan area.  For example, it shows 
        potential shallow aquifers and rock units that may be suitable for 
        waste disposal and aggregate mining.  The map distinguishes rock units 
        that are somewhat predictable (dependent on scale and uniformity of 
        the rock unit) in physical properties and mineral content, making the 
        map useful in planning.  Given this predictability, experts can use 
        the map to derive thematic maps that show the suitability of surficial 
        materials for various uses by man; or to derive maps that show areas 
        susceptible to certain hazards, for example, swelling soils, heaving 
        bedrock, and landslides.
      The digital map is designed to provide geologic data at 1:100,000 scale 
        to address urban growth issues and to help resolve conflicts among 
        planned uses of the land.
    Supplemental_Information:
      Coverages included in this geospatial database:
      denver: polygon coverage of geologic units and faults
      geol_sfo.lin: lineset file that defines geologic line types in the 
        geologically themed coverages
      wpgcmykg.shd: shadeset file that defines the cmyk values of colors 
        assigned to polygons in the geologically themed coverages
  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 1979
    Currentness_Reference: publication date
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: none currently planned
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -105.3750000
      East_Bounding_Coordinate: -104.6250000
      North_Bounding_Coordinate: 40.00000000
      South_Bounding_Coordinate: 39.37500000
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: American Geological Institute Glossary of 
        Geology
      Theme_Keyword: Geologic map
      Theme_Keyword: Quaternary deposits
      Theme_Keyword: Rocky Flats Alluvium
      Theme_Keyword: windblown sand
      Theme_Keyword: eolian sand
      Theme_Keyword: alluvial gravel
      Theme_Keyword: landslide deposit
      Theme_Keyword: geologic hazard
      Theme_Keyword: land-use planning
      Theme_Keyword: urban growth
      Theme_Keyword: urban zoning
      Theme_Keyword: aggregate
      Theme_Keyword: mine subsidence
      Theme_Keyword: Paleocene bedrock
      Theme_Keyword: Arapahoe Formation
      Theme_Keyword: Oligocene bedrock
      Theme_Keyword: Wall Mountain Tuff
      Theme_Keyword: Pierre Shale
      Theme_Keyword: Dawson Formation
      Theme_Keyword: Cretaceous rocks
      Theme_Keyword: Denver Formation
      Theme_Keyword: Paleozoic rocks
      Theme_Keyword: Silver Plume quartz monzonite
      Theme_Keyword: Pikes Peak granite
      Theme_Keyword: Denver Creek granodiorite
      Theme_Keyword: Precambrian rocks
      Theme_Keyword: Golden Fault
    Place:
      Place_Keyword_Thesaurus: Board of Geographic Names
      Place_Keyword: USA
      Place_Keyword: United States of America
      Place_Keyword: Colorado
      Place_Keyword: Denver County
      Place_Keyword: Jefferson County
      Place_Keyword: Denver County
      Place_Keyword: Adams County
      Place_Keyword: Arapahoe County
      Place_Keyword: Denver
      Place_Keyword: Golden
      Place_Keyword: Colorado Front Range
      Place_Keyword: Colorado Piedmont
      Place_Keyword: Front Range Urban Corridor
      Place_Keyword: Douglas County
      Place_Keyword: Elbert County
  Access_Constraints: none
  Use_Constraints: none.  Acknowledgment of the U.S. Geological Survey would 
    be appreciated in products derived from these data.  Although software 
    enables the user to display images at various scales, map data in this 
    report should not be used at scales greater than 1:100,000.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Theodore R. Brandt
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: MS 980, Box 25046 DFC
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225-0046
        Country: USA
      Contact_Voice_Telephone: 303-236-1901
      Contact_Facsimile_Telephone: 303-236-0214
      Contact_Electronic_Mail_Address: tbrandt@usgs.gov
  Browse_Graphic:
    Browse_Graphic_File_Name: 
      http://pubs.usgs.gov/imap/2004/i-856-h/i-856-h_v1.0.pdf
    Browse_Graphic_File_Description: graphic representation of map layout
    Browse_Graphic_File_Type: PDF
  Data_Set_Credit: Theodore R. Brandt, U.S. Geological Survey, served as GIS 
    coordinator in the creation of the GIS database and produced the digital 
    cartography.  David W. Moore, U.S. Geological Survey, assisted in proofing 
    the geologic data and producing metadata.  Kyle A. Murray and Erica L. 
    Koch, formerly of the U.S. Geological Survey, and Paco Van Sistine, U.S. 
    Geological Survey, assisted in the digitization of the GIS database.
  Native_Data_Set_Environment:
    Windows_2000, Intel
    ARC/INFO version 8.3
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Geologic map unit linework was captured by hand 
      digitizing as well as heads-up digitizing of scans from the paper geologic 
      map and negatives as originally published in 1979.  The digital map was 
      assembled and edited in ARC/INFO.  Water bodies (reservoirs and lakes) shown 
      on the paper version of the map were digitized in the geologic map unit 
      polygon layer.  This was done to (1) ensure topology of geologic polygons 
      that closed on shorelines of reservoirs and other water bodies, and (2) 
      adhere to interpretations regarding which geologic unit(s) are under the 
      water bodies.  Attribute accuracy is tested by manually comparing hard copy 
      plots of the digital data with the previously published version of the paper 
      map.
  Logical_Consistency_Report:
    Map elements were visually checked for overshoots, undershoots, duplicate 
      features, and other errors.  The original Trimble and Machette published 
      paper map (USGS Map I-856-H Version 1.0) conformed with U.S. Geological 
      Survey editorial standards and stratigraphic nomenclature.  The digital 
      version of Map I-856-H (version 1.1) strictly follows this nomenclature and 
      was reviewed by another geologist and cartographer for consistency with 
      basic geologic principles and general conformity to USGS mapping standards.  
      ARC/INFO software was used to create topological relations among features.
  Completeness_Report:
    This report has been reviewed for conformity with U.S. Geological Survey 
      editorial standards and stratigraphic nomenclature.  Data are complete.  
      Properties and physical characteristics of geologic map units (rock-
      stratigraphic and surficial units) are described in the text explanation 
      provided on the paper version of the map.  A digital base map coverage is 
      not included.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: 
        Most digitized positions on the map that depict distinct contacts between 
          rock formations in the field are estimated to be within about 50 m of 
          the actual contact on the land in most instances.  Boundaries (lines) 
          between Quaternary units (for example, terrace gravels) that correspond 
          closely to distinct edges of landforms (for example, river terraces) are 
          of comparable accuracy.  Boundaries (lines) between some Quaternary 
          units, such as eolian deposits and broad alluvial aprons, are 
          approximately located within an indefinite gradational zone between 
          them.  Horizontal positional accuracy is tested by visual comparison of 
          hard copy test plots to source maps or comparing locations of data on a 
          computer monitor to other data layers in the same geographic area.  The 
          database contains no elevation data.  Accuracy of these digital data 
          indirectly depends on accuracy of the base maps on which the original 
          source geologic maps were compiled.  These base maps were made by the 
          U.S. Geological Survey, which routinely checks them for compliance with 
          the National Map Accuracy Standards.

  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Bryant, Bruce
          Title: Reconnaissance geologic map of the Conifer quadrangle, Jefferson 
            County, Colorado
          Publication_Date: 1974
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-597
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1974
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Bryant (1974a)
      Source_Contribution: geologic data source

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Bryant, Bruce
          Title: Reconnaissance geologic map of the Pine quadrangle, Jefferson 
            County, Colorado
          Publication_Date: 1974
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-598
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1974
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Bryant (1974b)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Bryant B.H., 
          Originator: Miller R.D., and 
          Originator: Scott G.R.
          Title: Geologic map of the Indian Hills quadrangle, Jefferson County, 
            Colorado
          Publication_Date: 1973
          Series_Information:
            Series_Name: U.S. Geological Survey Geologic Quadrangle Map
            Issue_Identification: GQ-1073
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1973
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Bryant and others (1973)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Hedge, C.E.
          Title: A petrogenetic and geochronologic study of migmatites and 
            pegmatites in the central Front Range
          Publication_Date: 1969
          Series_Information:
            Series_Name: Colorado School of Mines 
            Issue_Identification: unpublished Ph.D. thesis
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1969
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Hedge (1969)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Hedge, C.E.
          Originator: Peterman, Z.E.
          Originator: Braddock, W.A.
          Title: Age of the major Precambrian regional metamorphism in the 
            northern Front Range, Colorado
          Publication_Date: 1967
          Series_Information:
            Series_Name: Geological Society of America Bulletin
            Issue_Identification: v. 78
          Other_Citation_Details: p. 551-558
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1967
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Hedge and others (1967)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Hoblitt, R.
          Originator: Larson, E.
          Title: Paleomagnetic and geochronologic data bearing on the structural 
            evolution of the northeastern margin of the Front Range, Colorado
          Publication_Date: 1975
          Series_Information:
            Series_Name: Geological Society of America Bulletin
            Issue_Identification: v. 86
          Other_Citation_Details: p. 237-242
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1975
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Hoblitt and Larson (1975)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Hunt, C.B.
          Title: Pleistocene and Recent deposits in the Denver Area, Colorado
          Publication_Date: 1954
          Series_Information:
            Series_Name: U.S. Geological Survey Bulletin 
            Issue_Identification: 996-C
          Other_Citation_Details: p. 91-140
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1954
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Hunt (1954)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Izett, G.A.
          Originator: Scott, G.R.
          Originator: Obradovich, J.D.
          Title: Oligocene rhyolite in the Denver Basin, Colorado, in Geological 
            Survey Research 1969
          Publication_Date: 1969
          Series_Information:
            Series_Name: U.S. Geological Survey Professional Paper
            Issue_Identification: 650-B 
          Other_Citation_Details: p. B12-B14
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1969
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Izett and others (1969)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Lindvall, R.M.
          Title: Geologic map of the Arvada quadrangle, Adams, Denver, and 
            Jefferson Counties, Colorado
          Publication_Date: 1972
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-348
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1972
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Lindvall (1972)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Lindvall, R.M.
          Title: Geologic map of the Fort Logan quadrangle, Denver and Jefferson 
            Counties, Colorado
          Publication_Date: 1976
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-831
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1976
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Lindvall (1976)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Lindvall, R.M.
          Title: Geologic map of the Commerce City quadrangle, Adams and Denver 
            Counties, Colorado
          Publication_Date: 1979
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-1067
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1979
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Lindvall (1979)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Maberry, J.O.
          Originator: Lindvall, R.M.
          Title: Geologic map of the Parker quadrangle, Arapahoe and Douglas 
            Counties, Colorado
          Publication_Date: 1972
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Investigations Map
            Issue_Identification: I-770-A
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1972
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Maberry and Lindvall (1972)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Maberry, J.O.
          Originator: Lindvall, R.M.
          Title: Geologic map and engineering data for the Highlands Ranch 
            quadrangle, Arapahoe and Douglas Counties, Colorado
          Publication_Date: 1974
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-631
          Other_Citation_Details: 3 sheets
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1974
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Maberry and Lindvall (1974)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Machette, M.N.
          Title: Geologic map of the Lafayette quadrangle, Adams, Boulder, and 
            Jefferson Counties, Colorado
          Publication_Date: 1975
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-656
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1975
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Machette (1975)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Malde, H.E.
          Title: Surficial geology of the Louisville quadrangle, Colorado
          Publication_Date: 1955
          Series_Information:
            Series_Name: U.S. Geological Survey Bulletin 
            Issue_Identification: 996-E
          Other_Citation_Details: p. 217-259
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1955
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Malde (1955)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Peterson, W.L.
          Title: Geology of the Platte Canyon quadrangle, Colorado
          Publication_Date: 1964
          Series_Information:
            Series_Name: U.S. Geological Survey Bulletin
            Issue_Identification: 1181-C
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1964
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Peterson (1964)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Richardson, G.B.
          Title: Castle Rock, Colorado
          Publication_Date: 1915
          Series_Information:
            Series_Name: U.S. Geological Survey Atlas
            Issue_Identification: Folio 198
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1915
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Richardson (1915)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Schwochow, S.D.
          Title: Surficial geology of the Eastlake quadrangle, Adams County, 
            Colorado
          Publication_Date: 1972
          Series_Information:
            Series_Name: Colorado School of Mines M.S. thesis
            Issue_Identification: no. 1465
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1972
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Schwochow (1972)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Scott, G.R.
          Title: Preliminary geologic map of the Indian Hills quadrangle, 
            Jefferson County, Colorado
          Publication_Date: 1961
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Investigations Map 
            Issue_Identification: I-333.
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1961
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Scott (1961)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Scott, G.R.
          Title: Geology of the Littleton quadrangle, Jefferson, Douglas, and 
            Arapahoe Counties, Colorado
          Publication_Date: 1962
          Series_Information:
            Series_Name: U.S. Geological Survey Bulletin
            Issue_Identification: 1121-L
          Other_Citation_Details: 53 p.
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1962
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Scott (1962)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Scott, G.R.
          Title: Quaternary geology and geomorphic history of the Kassler 
            quadrangle, Colorado
          Publication_Date: 1963
          Series_Information:
            Series_Name: U.S. Geological Survey Professional Paper
            Issue_Identification: 421-A
          Other_Citation_Details: p. 1-70
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1963
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Scott (1963a)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Scott, G.R.
          Title: Bedrock geology of the Kassler quadrangle, Colorado
          Publication_Date: 1963
          Series_Information:
            Series_Name: U.S. Geological Survey Professional Paper
            Issue_Identification: 421-B
          Other_Citation_Details: p. 71-125
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1963
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Scott (1963b)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Scott, G.R.
          Title: Geologic map of the Morrison quadrangle, Jefferson County, 
            Colorado
          Publication_Date: 1972
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Investigations Map
            Issue_Identification: I-790-A
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1972
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Scott (1972)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Scott, G.R.
          Originator: Wobus, R.A.
          Title: Reconnaissance geologic map of Colorado Springs and vicinity
          Publication_Date: 1973
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
            Issue_Identification: MF-482
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1973
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Scott and Wobus (1973)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Sheridan, D.M.
          Originator: Maxwell, C.H.
          Originator: Albee, A.L.
          Originator: Van Horn, R.
          Title: Geology and uranium deposits of the Ralston Buttes district, 
            Jefferson County, Colorado
          Publication_Date: 1967
          Series_Information:
            Series_Name: U.S. Geological Survey Professional Paper
            Issue_Identification: 520
          Other_Citation_Details: 121 p.
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1967
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Sheridan and others (1967)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Sheridan, D.M.
          Originator: Reed, J.C., Jr.
          Originator: Bryant, B.H.
          Title: Geologic map of the Evergreen quadrangle, Jefferson County 
            Colorado
          Publication_Date: 1972
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Investigations Map
            Issue_Identification: I-786-A
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1972
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Sheridan and others (1972)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Spencer, F.D.
          Title: Bedrock geology of the Louisville quadrangle, Colorado
          Publication_Date: 1961
          Series_Information:
            Series_Name: U.S. Geological Survey Geologic Quadrangle Map
            Issue_Identification: GQ-151
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1961
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Spencer (1961)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Van Horn, Richard
          Title: Bedrock geology of the Golden quadrangle, Colorado
          Publication_Date: 1957
          Series_Information:
            Series_Name: U.S. Geological Survey Geologic Quadrangle Map
            Issue_Identification: GQ-103
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1957
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Van Horn (1957)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Van Horn, Richard
          Title: Surficial and bedrock geologic map of the Golden quadrangle, 
            Jefferson County, Colorado
          Publication_Date: 1972
          Series_Information:
            Series_Name: U.S. Geological Survey Miscellaneous Investigations Map
            Issue_Identification: I-761-A
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1972
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Van Horn (1972)
      Source_Contribution: geologic data source 

    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Wells, J.D.
          Title: Geology of the Eldorado Springs quadrangle, Boulder and Jefferson 
            Counties, Colorado
          Publication_Date: 1967
          Series_Information:
            Series_Name: U.S. Geological Survey Bulletin
            Issue_Identification: 1221-D
          Other_Citation_Details: 85 p.
      Type_of_Source_Media: paper
      Source_Time_Period_of_Content: 
        Time_Period_Information: 
          Single_Date/Time: 
            Calendar_Date: 1967
        Source_Currentness_Reference: publication date
      Source_Citation_Abbreviation: Wells (1967)
      Source_Contribution: geologic data source 

    Process_Step:
      Process_Description: The geology for the published paper map was compiled by 
        Donald Trimble and Michael Machette.
      Process_Date: 1977
    Process_Step:
      Process_Description: The geologic database was compiled using ARC/INFO.  
        Subsequent to this original compilation, we edited and corrected the 
        database by digitizing directly into ARC/INFO from optical enlargements of 
        the original published map.  An average RMS error of 0.003 inches or 
        better was achieved in digitizing these features.
      Process_Date: 1999
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 5
          Ordinate_Resolution: 5
        Planar_Distance_Units: METERS
      Grid_Coordinate_System:
        Universal_Transverse_Mercator:
          UTM_Zone_Number: 13
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: .9999
            Longitude_of_Central_Meridian: -105.00
            Latitude_of_Projection_Origin: 0.00
            False_Easting: 0.00
            False_Northing: 0.00
        Grid_Coordinate_System_Name: Universal Transverse Mercator
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1927
      Ellipsoid_Name: Clarke 1866
      Semi-major_Axis: 6378206.4
      Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      The data is supplied in ARC/INFO export format and ArcView shapefile format.
      DATABASE STRUCTURE - ARC/INFO ====================================
        This GIS database includes related look-up tables, which store 
        detailed attribute information.  This database structure is more fully 
        described in USGS OFR 99-438.  The GIS database structure used in the 
        database includes symbol and pattern items in coverage point, polygon 
        (PAT), and arc (AAT)attribute tables for user convenience.  Arc/Info 
        relates for each coverage are saved in a file named <covername>.rel.  Use 
        the RELATE command with the restore argument at the arc prompt to make the 
        relates active.  Alternatively, in Arctools, use the Relate environment: 
        open dialog in the Manage - Relates flyout menu under the Arctools menu to 
        make the relates active.

      denver coverage:  Contains all contact lines and label points for each 
        geologic polygon.  In the denver.pat INFO file the SOURCE item provides a 
        numeric code used to identify the data source for the rock unit.  Complete 
        references for the sources listed are listed in the denver.ref file.  The 
        LABEL item indicates the rock unit label (abbreviation) used to label unit 
        on map.  The MLABEL item indicates the rock unit label using the GeoAge 
        version 1.2 font, used to indicate the rock unit label using geologic age 
        letter symbols associated with the age of the lithologic units (for 
        example: Triassic, Pennsylvanian, Cambrian).  The DESC item defines formal 
        or informal unit name.  The SYMBOL item contains the shadeset symbol 
        number used by ArcInfo to plot a filled/shaded polygon.  The symbol 
        numbers in this item refer to the wpgcmykg.shd shadeset included with the 
        dataset.  The PATTERN item contains the shadeset symbol used by ArcInfo to 
        plot a patterned polygon.  The symbol numbers in this item refer to the 
        plotter.shd shadeset included with ArcInfo V.8.1.
      In the denver.aat INFO file the LINECODE item provides a numeric code used 
        to identify type of linear feature.  Linecodes less than 100 are used for 
        contacts and boundaries which are described in the denver.con file.  
        Linecodes greater than 100 are used for structures that are described in 
        the denver.str file.  The NAME item lists the name given to structural 
        feature.  The SOURCE item lists the numeric code used to identify the data 
        source for the linear feature.  Complete references for the sources are 
        listed in the denver.ref file.
      Related look-up table files are denver.con, denver.str, denver.ru, and 
        denver.ref.  In the denver.con INFO file, the LINECODE item indicates the 
        numeric code (a value less than 100) used to identify type of contact or 
        boundary.  The SYMBOL item lists the line symbol number used by ArcInfo to 
        plot the line (symbol numbers refer to the geol_sfo.lin lineset included 
        with the dataset).  The TYPE item lists the major type of line (for 
        example, contact, State boundaries, lines of latitude and longitude used 
        for neatlines).  The MODIFIER item lists the line type modifier, (that is, 
        approximate, concealed, or gradational).  No entry implies 'known.'  The 
        CERTAINTY item lists the degree of certainty of contact or boundary, (that 
        is, inferred or uncertain).  No entry implies 'certain.'  The DESC item 
        lists the written description or explanation of the contact or boundary.  
        In the denver.str INFO file, the LINECODE item indicates the numeric code 
        (a value greater than 100) used to identify type of structure.  The SYMBOL 
        item lists the line symbol number used by ArcInfo to plot the line (symbol 
        numbers refer to the geol_sfo.lin lineset included with the dataset).  The 
        TYPE item lists the major type of line, (for example, fault or fold-axis).  
        The HORIZONTAL item refers to the type of horizontal fault movement (for 
        example, left-lateral or right-lateral).  No entry implies 'unknown' or no 
        strike-slip movement.  The VERTICAL item refers to the type of vertical 
        fault movement (for example, normal).  No entry implies 'unknown' or no 
        dip-slip movement.  The FOLD item refers to the type of fold, (for 
        example, anticline or syncline).  The PLUNGE item refers to the type of 
        plunge on fold, (that is, horizontal, plunging, plunging in, or plunging 
        out).  The ACCURACY item refers to the line type modifier indicating 
        degree of accuracy, (that is, approximately located, concealed, 
        gradational).  No entry implies 'certain.'  The CERTAINTY item lists the 
        degree of certainty of structure, (that is, inferred, uncertain).  No 
        entry implies 'certain.'  The DESC item lists the written description or 
        explanation of the structure.  In the denver.ru INFO file, the UNIT item 
        refers to the numeric code used to identify the rock unit.  The LABEL item 
        refers to the rock unit label (abbreviation) used to label unit on map.  
        The DESC1 item lists the formal or informal unit name.  The DESC2 item 
        contains a parsed portion of the description of the unit.  The DESC3 item 
        contains a parsed portion of the description of the unit.  The DESC4 item 
        contains a parsed portion of the description of the unit.  In the 
        denver.ref INFO file, the SOURCE item lists the numeric code used to 
        identify the data source.  The SCALE item lists the scale of the source 
        map.  (This value is the denominator of the proportional fraction that 
        identifies the scale of the map that was digitized or scanned to produce 
        the digital map.)  The AUTHORS item lists the author(s) or compiler(s) of 
        source map entered as last name, first name or initial, and middle 
        initial.  The YEAR item lists the source (map) publication date.  The 
        REFERENCE item lists the remainder of the reference in USGS reference 
        format.

      The INFO structure of these files is listed below:
      >DENVER.PAT:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  AREA                   8    18     F      5
      >    9  PERIMETER              8    18     F      5
      >   17  DENVER#                4     5     B      -
      >   21  DENVER-ID              4     5     B      -
      >   25  SOURCE                 4     4     I      -
      >   29  LABEL                 10    10     C      -
      >   39  MLABEL                10    10     C      -
      >   49  DESC                 100   100     C      -
      >  149  SYMBOL                 3     3     I      -
      >  152  PATTERN                4     4     I      -
      >DENVER.AAT:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  FNODE#                 4     5     B      -
      >    5  TNODE#                 4     5     B      -
      >    9  LPOLY#                 4     5     B      -
      >   13  RPOLY#                 4     5     B      -
      >   17  LENGTH                 8    18     F      5
      >   25  DENVER#                4     5     B      -
      >   29  DENVER-ID              4     5     B      -
      >   33  LINECODE               3     3     I      -
      >   36  NAME                  80    80     C      -
      >  116  SOURCE                 4     4     I      -
      >  120  SYMBOL                 3     3     I      -
      >DENVER.CON:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  LINECODE               3     3     I      -
      >    4  SYMBOL                 3     3     I      -
      >    7  TYPE                  10    10     C      -
      >   17  MODIFIER              20    20     C      -
      >   37  CERTAINTY             15    15     C      -
      >   52  DESC                 100   100     C      -
      >DENVER.STR:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  LINECODE               3     3     I      -
      >    4  SYMBOL                 3     3     I      -
      >    7  TYPE                  10    10     C      -
      >   17  HORIZONTAL            20    20     C      -
      >   37  VERTICAL              20    20     C      -
      >   57  FOLD                  15    15     C      -
      >   72  PLUNGE                15    15     C      -
      >   87  ACCURACY              15    15     C      -
      >  102  CERTAINTY             15    15     C      -
      >  117  DESC                 100   100     C      -
      >DENVER.RU:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  LABEL                 10    10     C      -
      >   11  DESC1                200   200     C      -
      >  211  DESC2                200   200     C      -
      >  411  DESC3                200   200     C      -
      >  611  DESC4                200   200     C      -
      >DENVER.REF:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  SOURCE                 4     4     I      -
      >    5  SCALE                  8     8     I      -
      >   13  AUTHORS              200   200     C      -
      >  213  YEAR                   4     4     I      -
      >  217  REFERENCE            250   250     C      -

      >Coding of LABEL and DESC attributes in the denver coverage:
      >LABEL       |   DESC
      >Cr          |   Unnamed rocks (Cambrian)
      >Fault zone  |   Fault zone - Zone of intense fault brecciation, usually 
                         associated with numerous en echelon faults
      >JPml        |   Morrison, Ralston Creek, and Lykins Formations, 
                         undifferentiated (Upper Jurassic to Upper Permian)
      >Jmr         |   Morrison and Ralston Creek Formations (Upper Jurassic)
      >Kcgg        |   Carlile Shale, Greenhorn Limestone, and Graneros Shale, 
                         undifferentiated (Upper Cretaceous)
      >Kd          |   Dakota Group (Lower Cretaceous)
      >Kf          |   Fox Hills Sandstone (Upper Cretaceous)
      >Kl          |   Laramie Formation (Upper Cretaceous)
      >Kn          |   Niobrara Formation (Upper Cretaceous)
      >Kp          |   Pierre Shale (Upper Cretaceous)
      >PPf         |   Fountain Formation (Lower Permian to Middle Pennsylvanian)
      >PPfl        |   Lyons Sandstone and Fountain Formation, undifferentiated
      >Ply         |   Lyons Sandstone (Permian)
      >Qb          |   Broadway Alluvium (upper Pleistocene)
      >Qco         |   Colluvium (upper Holocene)
      >Qes         |   Windblown sand (lower Holocene to upper Pleistocene)
      >Ql          |   Loess (upper Pleistocene)
      >Qlo         |   Louviers Alluvium (upper Pleistocene)
      >Qls         |   Landslide deposits (Holocene to Middle? Pleistocene)
      >Qn          |   Nussbaum Alluvium (Pleistocene)
      >Qp          |   Post-Piney Creek and Piney Creek Alluvium (Upper Holocene)
      >Qrf         |   Rocky Flats Alluvium (Pleistocene)
      >Qs          |   Slocum Alluvium (Pleistocene)
      >Qv          |   Verdos Alluvium (Pleistocene)
      >TKd         |   Denver Formation (Paleocene and Upper Cretaceous)
      >TKda        |   Dawson and Arapahoe Formations (Paleocene to Upper 
                         Cretaceous)
      >TRPl        |   Lykins Formation (Lower Triassic and Upper Permian)
      >Tcr         |   Castle Rock Conglomerate (lower Oligocene)
      >Tg          |   High-level gravel deposits (Pliocene to Oligocene)
      >Tgm         |   Green Mountain Conglomerate (Paleocene)
      >Ts          |   Shoshonite (lower Paleocene)
      >Twm         |   Wall Mountain Tuff (lower Oligocene)
      >Xa          |   Amphibolite, hornblendite, and related rocks (Precambrian 
                         X)
      >Xbc         |   Boulder Creek Granodiorite (Precambrian X)
      >Xfg         |   Felsic gneiss (Precambrian X)
      >Xg          |   Gneiss (Precambrian X)
      >Xq          |   Quartzite (Precambrian X)
      >Xqm         |   Quartz monzonite (Precambrian X)
      >Xs          |   Schist (Precambrian X)
      >YXp         |   Pegmatite (Precambrian Y and X)
      >Ypp         |   Pikes Peak Granite (Precambrian Y)
      >Ysp         |   Silver Plume Quartz Monzonite (Precambrian Y)
      >w           |   Open water

      >Coding of LINECODE and NAME attributes in the boulder coverage:
      >LINECODE  |     NAME
      >   1      |     Contact - Certain
      >  41      |     Shoreline
      >  81      |     Map boundary
      > 101      |     Fault - Certain
      > 103      |     Fault - Concealed
      > 171      |     Thrust fault - Certain
      > 173      |     Thrust fault - Concealed

    Entity_and_Attribute_Detail_Citation: 
      http://wrgis.wr.usgs.gov/open-file/of99-438/

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: CO
        Postal_Code: 80225-0046
      Contact_Voice_Telephone: 303-236-5486
  Distribution_Liability: Although this digital spatial database has been 
    subjected to rigorous review and is substantially complete, it is released on 
    the condition that neither the USGS nor the United States Government nor any 
    agency thereof, nor any employees thereof, makes any warranty, expressed or 
    implied, or assumes any legal liability or responsibility for the accuracy, 
    completeness, or usefulness of any information, apparatus, product, or process 
    disclosed in this report, or represents that its use would not infringe 
    privately owned rights.  Reference therein to any specific commercial product, 
    process, or service by trade name, trademark, manufacturer, or otherwise does 
    not necessarily constitute or imply its endorsement, recommendation, or 
    favoring by the United States Government or any agency thereof.  Any views and 
    opinions of authors expressed herein do not necessarily state or reflect those 
    of the United States Government or any agency thereof.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ARCE,SHP
        Format_Version_Number: 8.3
        Format_Version_Date: 2003
        File_Decompression_Technique: GZIP TAR archive, In UNIX use the command 
          "gunzip -c <filename> | tar xvf -" In Windows, use WinZip 
          (http://www.winzip.com/) or other programs to extract the file.
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/imap/2004/i-856-h/
    Fees: none

Metadata_Reference_Information:
  Metadata_Date: 2004
  Metadata_Review_Date: 2004
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Theodore Brandt
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: mailing address
        Address: U.S. Geological Survey
        Address: MS 980, Box 25046 Denver Federal Center
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225-0046
      Contact_Voice_Telephone: 303-236-1901
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998