Geology of the Boulder-Fort Collins-Greeley area, Colorado (boulder)

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: GIS database by Theodore R. Brandt, David W. Moore, and Kyle E. Murray; Digital Cartography by Theodore R. Brandt
Publication_Date: 2004
Title:
Geology of the Boulder-Fort Collins-Greeley area, Colorado (boulder)
Edition: version 1.1
Geospatial_Data_Presentation_Form: Downloadable GIS Data
Publication_Information:
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/ds/2006/193/
Larger_Work_Citation:
Citation_Information:
Originator: Roger B. Colton
Publication_Date: 1978
Title:
Geologic Map of the Boulder-Fort Collins-Greeley area, Colorado
Edition: version 1.1
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: USGS Miscellaneous Investigations Series
Issue_Identification: I-855-G
Publication_Information:
Publication_Place: Denver, Colorado, U.S.A.
Publisher: United States Geological Survey
Online_Linkage: http://pubs.usgs.gov/imap/855/G/
Description:
Abstract:
This digital map shows the geographic extent of rock stratigraphic units (formations) as compiled by Colton in 1976 under the Front Range Urban Corridor Geology Program.  Colton used his own geologic mapping and previously published geologic maps to compile one map having a single classification of geologic units.  The resulting published color paper map (USGS Map I-855-G, Colton, 1978) was intended for land-use planning and to depict the regional geology.  In 1997-1999, another USGS project designed to address urban growth issues was undertaken. This project, the USGS Front Range Infrastructure Resources Project, undertook to digitize Colton's map at 1:100,000 scale, making it useable in Geographical Information Systems (GIS). That product is described here.
In general, the digitized map dipicts in its western part Precambrian igneous and metamorphic rocks, Pennsylvanian and younger sedimentary rock units, major faults, and brecciated zones along an eastern strip (5-20 km wide) of the Front Range.  The central and eastern parts of the map (Colorado Piedmont) show a mantle of Quaternary unconsolidated deposits and interspersed outcrops of sedimentary rock of Cretaceous or Tertiary age. A surficial mantle of unconsolidated deposits of Quaternary age is differentiated and depicted as eolium (wind-blown sand and silt), alluvium (river gravel, sand, and silt of variable composition), colluvium, and a few landslide deposits.  At the mountain front, north-trending, Paleozoic and Mesozoic formations of sandstone, shale, and minor limestone dip mostly eastward and form folds, fault blocks, hogbacks and intervening valleys.  Local dikes and sills of Tertiary rhyodacite and basalt intrude rocks near the range front, mostly in the Boulder area.
Purpose:
This digital map can serve various purposes.  For example, it shows potential shallow aquifers and geologic units that may be suitable for waste disposal and aggregate mining.  The map distinguishes units that are broadly predictable in physical properties and mineral content, making the map a potential tool for planning for urban growth and zoning.  Ideally, qualified experts can use the map to derive information that will conduce to optimum use of the land in urbanized regions.    Supplemental_Information:
Coverages included in this geospatial database:
boulder:  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: 1978
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -105.3750000
East_Bounding_Coordinate: -104.6250000
North_Bounding_Coordinate: 40.62500000
South_Bounding_Coordinate: 40.00000000
Keywords:
Theme:
Theme_Keyword_Thesaurus: American Geological Institute Glossary of Geology
Theme_Keyword: Geologic map
Theme_Keyword: Quaternary deposits
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 and Eocene igneous rocks
Theme_Keyword: Cretaceous rocks
Theme_Keyword: Paleozoic rocks
Theme_Keyword: Silver Plume quartz monzonite
Theme_Keyword: Boulder Creek granodiorite
Theme_Keyword: Precambrian rocks
Theme:
Theme_Keyword_Thesaurus: ArcIMS Metadata Server Theme Codes
Theme_Keyword: geoscientificInformation
Theme_Keyword: economy
Theme_Keyword: environment
Place:
Place_Keyword_Thesaurus: Board of Geographic Names
Place_Keyword: USA
Place_Keyword: United States of America
Place_Keyword: Colorado
Place_Keyword: Boulder County
Place_Keyword: Weld County
Place_Keyword: Larimer County
Place_Keyword: Boulder
Place_Keyword: Fort Collins
Place_Keyword: Greeley
Place_Keyword: Colorado Front Range
Place_Keyword: Colorado Piedmont
Place_Keyword: Front Range Urban Corridor
Place_Keyword: Jefferson 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_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Theodore R. Brandt
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://certmapper.cr.usgs.gov/data/frip/graphic/boulder.jpg
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Theodore Brandt, U.S. Geological Survey, served as project leader in the creation of the GIS database and produced the digital cartography.  David Moore, U.S. Geological Survey, assisted in proofing the geologic data and producing metadata.  Kyle Murray, Erica Koch, and Michael Baker, formerly of the U.S. Geological Survey, assisted in the digitization of the GIS database.  David Nealey, U.S. Geological Survey, retired, served as the original project leader for this database.
Native_Data_Set_Environment:
Windows_2000, Intel ARC/INFO version 8.3
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 Boulder-Fort Collins-Greeley area, Colorado, by Roger B. Colton
Edition: version 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: USGS Open-File Report
Issue_Identification: OFR-03-024
Publication_Information:
Publication_Place: Denver, Colorado, U.S.A.
Publisher: United States Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2003/ofr-03-024/
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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 map and negatives as originally published in 1978. Simultaneously, line symbols depicting land forms deliberately were not digitized because of time constraints. This ommission does not diminish the geologic data content. The omitted symbols depict terrace scarp, deflation basin, crest of dune, margin of migratory dune group, and buried channels. The digital map was assembled and edited in ARC/INFO.  Water bodies(reservoirs and lakes) that appear 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 paper version of the map.
Logical_Consistency_Report:
Map elements were visually checked for overshoots, undershoots, duplicate features, and other errors.  The original Colton published paper map (USGS Map I-855-G Version 1.0) conformed with U.S. Geological Survey editorial standards and stratigraphic nomenclature.  The digital version of Colton's map (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.  ArcInfo 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.  Map unit properties 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.  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 eolium and broad alluvial aprons are approximately located within an indefinite gradational zone between the units.  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 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: Braddock, W.A.
Originator: Calvert R.H.
Originator: Gawarecki S.J.
Originator: Nutalaya, Prinya
Publication_Date: 1970
Title:
Geologic map of the Masonville quadrangle, Larimer County, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Geologic Quadrangle Map
Issue_Identification: GQ-832
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1970
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Braddock and others (1970a)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Braddock, W.A.
Originator: Calvert, R.H.
Originator: O'Connor, J.T.
Originator: Swann, G.A.
Publication_Date: 1973
Title:
Geologic map and sections of Horsetooth Reservoir quadrangle, Larimer County, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Open-File Map
Issue_Identification: OFR-73-0029
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:
Braddock and others (1973)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Braddock, W.A.
Originator: Nutalaya, Prinya
Originator: Gawarecki, S.J.
Originator: Curtin, G.C.
Publication_Date: 1970
Title:
Geologic map of the Drake quadrangle, Larimer County, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Geologic Quadrangle Map
Issue_Identification: GQ-829
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1970
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Braddock and others (1970b)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Briscoe, H.J., Jr.
Publication_Date: 1972
Title:
Stratigraphy and aquifer characteristics of the Fox Hills sandstone in the Greeley area, Weld County, Colorado
Series_Information:
Series_Name: Colorado School of Mines
Issue_Identification: Master's thesis
Publication_Information:
Publication_Place: Golden, Colorado
Publisher: Colorado School of Mines
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:
Briscoe (1972)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ching, P.W.
Publication_Date: 1972
Title:
Economic gravel deposits of the lower Cache La Poudre River
Series_Information:
Series_Name: Colorado State University
Issue_Identification: Master's thesis
Publication_Information:
Publication_Place: Fort Collins, Colorado
Publisher: Colorado State University
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:
Ching (1972)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Davis, T.L.
Publication_Date: 1974
Title:
Seismic investigation of late Cretaceous faulting along the east flank of the central Front Range, Colorado
Series_Information:
Series_Name: Colorado School of Mines
Issue_Identification: Ph. D. thesis
Publication_Information:
Publication_Place: Golden, Colorado
Publisher: Colorado School of Mines
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:
Davis (1974)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Gardner, M.E.
Publication_Date: 1968
Title:
Preliminary report on the engineering geology of the Boulder quadrangle, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR-1968
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1968
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Gardner (1968)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Hershey, L.A.
Originator: Schneider, P.A., Jr.
Publication_Date: 1972
Title:
Geologic map of the lower Cache La Poudre River basin, north-central Colorado
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Geologic Investigations Map
Issue_Identification: I-687
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:
Hershey and Schneider (1972)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Hunter, Z.M.
Publication_Date: 1955
Title:
Areal geology of the foothills of the Front Range in northern Colorado
Series_Information:
Series_Name: GSA Bulletin
Issue_Identification: v. 66, no. 12, Part 2, p. 1677
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: Geological Society of America
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:
Hunter (1955)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Larson, E.
Originator: Hoblitt, R.
Publication_Date: 1973
Title:
Nature of the early Tertiary intrusives between Golden and Lyons, Colorado and their relation to the structural development of the Front Range
Series_Information:
Series_Name: Geological Society of America Guidebook
Issue_Identification: Trip Number 4 GSA meeting Boulder, Colorado
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:
Larson and Hoblitt (1973)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Madole, R.F.
Originator: Bachhuber, F.W.
Publication_Date: 1973
Title:
Geomorphology, palynology and paleomagnetic record of glacial Lake Devlin, Front Range (Colorado)
Series_Information:
Series_Name: Geological Society of America Rocky Mountain Section Guidebook
Issue_Identification: v.1, no.1
Other_Citation_Details:
Figure 11, Quaternary Deposits of lower Lefthand Creek
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:
Madole and Bachhuber (1973)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Madole, R.F.
Publication_Date: 1963
Title:
Quaternary geology of St Vrain drainage basin, Boulder County, Colorado
Series_Information:
Series_Name: The Ohio State University
Issue_Identification: Ph. D. thesis
Publication_Information:
Publication_Place: Columbus, Ohio
Publisher: The Ohio State University
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:
Madole (1963)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Marvin, R.F.
Originator: Young, E.J.
Originator: Mehnert, H.H.
Originator: Naeser, C.W.
Publication_Date: 1974
Title:
Summary of radiometric age determinations on Mesozoic and Cenozoic igneous rocks and uranium and base metal deposits in Colorado
Series_Information:
Series_Name: Isochron West
Issue_Identification: Number 11
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:
Marvin and others (1974)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Scott, G.R.
Originator: Cobban, W.A.
Publication_Date: 1965
Title:
Geologic and biostratigraphic map of the Pierre shale between Jarre Creek and Loveland, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Geological Investigations Map
Issue_Identification: I-439
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1965
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Scott and Cobban (1965)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Shelton, D.C.
Publication_Date: 1972
Title:
Thickness of alluvium and evaluation of aggregate resources in the lower Cache La Poudre River valley, Colorado by electrical resistivity techniques
Series_Information:
Series_Name: University of Colorado
Issue_Identification: Master's thesis
Publication_Information:
Publication_Place: Boulder, Colorado
Publisher: University of Colorado
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:
Shelton (1972)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Smith, R.O.
Originator: Schneider, P.A., Jr.
Originator: Petri, L.R.
Publication_Date: 1964
Title:
Ground water resources of the South Platte River Basin in western Adams and southwestern Weld Counties, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Water-Supply Paper
Issue_Identification: 1958
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:
Smith and others (1964)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Soister, P.E.
Publication_Date: 1965
Title:
Geologic map of the Fort Lupton quadrangle, Weld and Adams Counties, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Geological Quadrangle Map
Issue_Identification: GQ-397
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1965
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Soister (1965a)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Soister, P.E.
Publication_Date: 1965
Title:
Geologic map of the Hudson quadrangle, Weld and Adams Counties, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Geological Quadrangle Map
Issue_Identification: GQ-398
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1965
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Soister (1965b)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Soister, P.E.
Publication_Date: 1965
Title:
Geologic map of the Platteville quadrangle, Weld County, Colorado GQ-399.
Series_Information:
Series_Name: U.S. Geological Survey Geological Quadrangle Map
Issue_Identification: GQ-399
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1965
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Soister (1965c)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Trimble, D.E.
Publication_Date: 1975
Title:
Geologic map of the Niwot Quadrangle, Boulder County, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Geologic Quadrangle Map
Issue_Identification: GQ-1229
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:
Trimble (1975)
Source_Contribution:
geologic data source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Wrucke, C.T.
Originator: Wilson, R.F.
Publication_Date: 1964
Title:
Geology of the Boulder quadrangle, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report.
Issue_Identification: OFR-1967
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:
Wrucke and Wilson (1964)
Source_Contribution:
geologic data source
Process_Step:
Process_Description:
The geology for the published paper map was compiled by Roger Colton.
Process_Date: 1976
Process_Step:
Process_Description:
The geologic database was compiled using the GSMCAD public domain program (USGS Open-File Report 96-007; program availible at http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-96-0007/gsmcadin.exe).  It was exported to Arc/Info using the GSMCAD export function to create ARC generate ASCII files. The gsmarc.aml script provide with the GSMCAD program was used in Arc/Info to convert the ASCII files to ARC coverages and build polygons.  Subsequent to this original compilation, edits and corrections to the database were performed through digitization directly into ArcInfo 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
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 13
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: .9996
Longitude_of_Central_Meridian: -105.00
Latitude_of_Projection_Origin: 0.00
False_Easting: 500000.00
False_Northing: 0.00
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.001
Ordinate_Resolution: 0.001
Planar_Distance_Units: METERS
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
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Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The data is supplied in ARC/INFO export 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.
boulder coverage:  Contains all contact lines and label points for each geologic polygon. In the boulder.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 boulder.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 Arc/Info v.8.1.
In the boulder.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 that are described in the boulder.con 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 boulder.ref file.
Related look-up table files are boulder.con, boulder.str, boulder.ru, and boulder.ref.  In the boulder.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 Arc/Info 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 list 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, (for example, inferred or uncertain).  No entry implies 'certain.'  The DESC item lists the written description or explanation of the contact or boundary.  In the boulder.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 Arc/Info 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 motion.  The VERTICAL item refers to the type of vertical fault movement, (for example, normal).  No entry implies 'unknown' or no dip-slip motion.  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, (for example, approximately located, concealed, or gradational).  No entry implies 'certain.'  The CERTAINTY item lists the degree of certainty of structure, (for example, inferred or uncertain).  No entry implies 'certain.'  The DESC item lists the written description or explanation of the structure.  In the boulder.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.  The DESC5 item contains a parsed portion of the description of the unit.  The DESC6 item contains a parsed portion of the description of the unit.  The DESC7 item contains a parsed portion of the description of the unit.  In the boulder.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:
>BOULDER.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  BOULDER#               4     5     B      -
>   21  BOULDER-ID             4     5     B      -
>   25  SOURCE                 4     4     I      -
>   29  LABEL                 10    10     C      -
>   39  MLABEL                10    10     C      -
>   49  DESC                 180   180     C      -
>  229  SYMBOL                 3     3     I      -
>  232  PATTERN                4     4     I      -
>BOULDER.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  BOULDER#               4     5     B      -
>   29  BOULDER-ID             4     5     B      -
>   33  LINECODE               3     3     I      -
>   36  NAME                  80    80     C      -
>  116  SOURCE                 4     4     I      -
>  120  SYMBOL                 3     3     I      -
>BOULDER.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      -
>BOULDER.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      -
>BOULDER.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      -
>  811  DESC5                200   200     C      -
> 1011  DESC6                200   200     C      -
> 1211  DESC7                200   200     C      -
>BOULDER.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 boulder coverage:
>LABEL       |   DESC
>Fault zone  |    Brecciated rock
>JTRmj       |      Morrison Formation (Upper Jurassic), Canyon Springs Member of Sundance Formation (Upper Jurassic), and Jelm Formation (Upper Triassic)
>Kcg         |      Carlile Shale (Upper Cretaceous), Greenhorn Limestone (Upper Cretaceous), and Graneros Shale (Upper and Lower Cretaceous)
>Kd          |    Dakota Group (Lower Cretaceous)
>Kfh         |    Fox Hills Sandstone (Upper Cretaceous)
>Kl          |    Laramie Formation (Upper Cretaceous)
>Kn          |    Niobrara Formation (Upper Cretaceous)
>Kph         |    Hygiene Sandstone Member of Pierre Shale (Upper Cretaceous)
>Kpl         |    Lower shale member of Pierre Shale (Upper Cretaceous)
>Kpm         |    Middle shale member of Pierre Shale (Upper Cretaceous)
>Kprl        |    Richard Sandstone Member, unnamed shale member, Larimer Sandstone Member, unnamed shale member, and Rocky Ridge Sandstone Member of Pierre Shale (Upper Cretaceous)
>Kptz        |    Upper transition member of Pierre Shale (Upper Cretaceous)
>Kpu         |    Upper shale member of Pierre Shale (Upper Cretaceous)
>PPf         |    Fountain Formation (Permian and Pennsylvanian)
>Pi          |    Ingleside Formation (Permian)
>Ply         |    Lyons Sandstone (Permian)
>Psi         |    Satanka and Ingleside Formations (Permian)
>Qb          |      Broadway Alluvium (Pinedale Glaciation, Pleistocene)
>Qc          |    Colluvium (upper Holocene to Pleistocene)
>Qe          |      Eolium (windblown clay, silt (loess), sand, and granules) (upper Holocene to Bull Lake Glaciation)
>Ql          |    Landslide deposits (Holocene to Pleistocene)
>Qlo         |      Louviers Alluvium (Bull Lake Glaciation, Pleistocene)
>Qpc         |    Piney Creek Alluvium (upper Holocene)
>Qpp         |    Post-Piney Creek Alluvium (upper Holocene)
>Qprf        |      Pre-Rocky Flats Alluvium (Nebraskan(?) Glaciation, Pleistocene)
>Qrf         |      Rocky Flats Alluvium (Aftonian Interglaciation or Nebraskan Glaciation, Pleistocene)
>Qs          |      Slocum Alluvium (Sangamon Interglaciation or Illinoian Glaciation, Pleistocene)
>Qt          |    Talus (upper Holocene to Pleistocene)
>Qv          |      Verdos Alluvium (Yarmouth Interglaciation or Kansan Glaciation, Pleistocene)
>TKda        |    Denver (Paleocene and Upper Cretaceous) and Arapahoe (Upper Cretaceous) Formations
>TRPl        |    Lykins Formation (Triassic and Permian)
>Tb          |    Boulder deposits (Pliocene?)
>Ti          |    Rhyodacite and basalt (Paleocene)
>Tqm         |    Quartz monzonite (Eocene)
>Xa          |    Amphibolite (Precambrian X)
>Xb          |    Porphyroblastic biotite schist (Precambrian X)
>Xbc         |    Boulder Creek Granodiorite (Precambrian X)
>Xk          |    Knotted mica schist (Precambrian X)
>Xq          |    Quartzofeldspathic schist and gneiss interbedded with mica schist and gneiss (Precambrian X)
>Xt          |    Tonalite (Precambrian X)
>YXp         |    Pegmatite (Precambrian Y or X)
>Ysp         |    Silver Plume Quartz Monzonite (Precambrian Y)
>af          |    Artificial fill
>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
bfltmove coverage:  Contains points recording the locations of fault decorations indicating upthrown and downthrown blocks. In the bfltmove.pat INFO file the PTTYPE item lists the type of point symbol, U, upthrown block; D, downthrown block.  The LABEL item indicates the letter U or D used to label the fault decoration on the map.  The SYMBOL item lists the marker symbol used by ArcInfo to identify the type of structural map symbol(symbol numbers refer to the geoscamp2.mrk markerset).  The SOURCE item lists the numeric code used to identify the data source.
The INFO structure of these files is listed below:
>BFLTMOVE.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>  1  AREA                   8    18     F      5
>  9  PERIMETER              8    18     F      5
> 17  BFLTMOVE#              4     5     B      -
> 21  BFLTMOVE-ID            4     5     B      -
> 25  PTTYPE                80    80     C      -
>105  LABEL                 10    10     C      -
>115  SOURCE                 4     4     I      -

In the coverage's bfltmove.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.
> BFLTMOVE.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      -
Entity_and_Attribute_Detail_Citation:
http://wrgis.wr.usgs.gov/open-file/of99-438/
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address:
U.S. Geological Survey
					Central Publications Group
					MS 902 Box 25046
					Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5486
Resource_Description: Downloadable Data
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: ArcInfo Export File
Format_Information_Content:
geology geographic features
Transfer_Size: 10.3 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/data/frip/spatial/export/bouldere.zip
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Information_Content:
geology geographic features
Transfer_Size: 10.3 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/data/frip/spatial/shape/boulder.zip
Digital_Form:
Digital_Transfer_Information:
Format_Name: Image Map Service (CO_FrontRange)
Format_Version_Number: 4.01
Format_Specification:
ArcIMS Image Map Service
Format_Information_Content:
A web-based interactive mapping system that accesses an ArcIMS Map Service running on certmapper.cr.usgs.gov.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/pubs/servlet/MapViewerBroker?project=frip&Service=CO_FrontRange&OVMap=CO_overview
Access_Instructions:
This URL links to a web-based interactive mapping system that accesses an ArcIMS Image Map Service that runs in Netscape 4.7, Internet Explorer 4.5 and higher. The mapservice can also be accessed using any custom client that adheres to the protocol specified through ArcXML.
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE, SHP
Format_Version_Number: 8.1.2
Format_Version_Date: 2002
File_Decompression_Technique: GZIP self-extracting archive, Unix or Windows versions
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://pubs.usgs.gov/imap/855/G/
Fees: none
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Metadata_Reference_Information:
Metadata_Date: 2004
Metadata_Review_Date: 20050228
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Theodore R. Brandt
Contact_Organization: U.S. Geological Survey, Earth Surface Processes Team (formerly National Cooperative Geologic Mapping Team)
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
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