Geologic map of the Dillon quadrangle, Summit and Grand Counties, Colorado

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Karl S. Kellogg
Publication_Date: 2002
Title:
Geologic map of the Dillon quadrangle, Summit and Grand Counties, Colorado
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Miscellaneous Field Studies Map
Issue_Identification: MF-2390
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/mf/2002/mf-2390/
Description:
Abstract:
New 1:24,000-scale geologic mapping along the Interstate-70 urban corridor in western Colorado, in support of the USGS Central Region State/USGS Cooperative Geologic Mapping Project, is contributing to a more complete understanding of the stratigraphy, structure, tectonic evolution, and hazard potential of this rapidly developing region. The 1:24,000-scale Dillon quadrangle is near the headwaters of the Blue River and straddles features of the Blue River graben (Kellogg, 1999), part of the northernmost reaches of the Rio Grande rift, a major late Oligocene to recent zone of extension that extends from Colorado to Mexico. The Williams Range thrust fault, the western structural margin of the Colorado Front Range, cuts through the center of the quadrangle, although is mostly covered by surficial deposits.
The oldest rocks in the quadrangle underlie the Williams Fork Mountains and the ridge immediately east of South Fork Middle Fork River, and include biotite-sillimanite schist and gneiss, amphibolite, and migmatite that are intruded by granite inferred to be part of the 1,667-1,750 Ma Routt Plutonic Suite (Tweto, 1987). The oldest exposed sedimentary unit is the Upper Jurassic Morrison Formation, but Pennsylvanian Maroon Formation, a sequence of red sandstone, conglomerate, and interbedded shale, underlies the southern part of the quadrangle. The thickest sequence of sedimentary rocks is Cretaceous in age and includes at least 500 m of the Upper Cretaceous Pierre Shale. Surficial deposits include (1) an old, deeply dissected landslide deposit, possibly as old as Pliocene, on the west flank of the Williams Fork Mountains, (2) deeply weathered, very coarse gravel deposits underlying a mesa in the southwest part of the quadrangle (the Mesa Cortina subdivision. The gravels are gold bearing and were mined by hydraulic methods in the 1800s), (3) moderately to deeply weathered, widespread, bouldery material that is a combination of till of the Bull Lake glaciation, debris-flow deposits, landslide deposits, and possibly pre-Bull Lake till, (4) glacial deposits of both Bull Lake (middle Pleistocene) and Pinedale (late Pleistocene)glaciations, (5) recent landslide deposits, and (6)extensive colluvial and alluvial deposits.
Purpose:
To update and reinterpret earlier geologic mapping, and to achieve a uniform regional geologic database.
Data_Set_Structure:
Data_Set_Part:
Part_Name: dillonpoly
Part_Type: ArcInfo coverage
Part_Description: geologic unit polygons, contacts, faults, and marker beds
Data_Set_Part:
Part_Name: dillonline
Part_Type: ArcInfo coverage
Part_Description: fold axes and other linear features, chiefly fold axes, dikes, and lines of cross section
Data_Set_Part:
Part_Name: dillonpoint
Part_Type: ArcInfo coverage
Part_Description: Point geologic features of all types, including observations and measurements of geologic structure, geodetic control points, mineral and fossil occurrences, small geologic structures, and relevant manmade features.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2002
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency:
Irregular. Mapping is continuing in adjacent quadrangles and revisions may be made as required.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -106.125
East_Bounding_Coordinate: -106.0
North_Bounding_Coordinate: 39.750
South_Bounding_Coordinate: 39.625
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geologic maps
Theme_Keyword: geologic structure
Theme_Keyword: bedrock geologic units
Theme_Keyword: geospatial datasets
Theme_Keyword: geology
Theme:
Theme_Keyword_Thesaurus: American Geological Institute (AGI) Glossary of Geology
Theme_Keyword: Geologic map
Theme_Keyword: Dillon, Colorado
Theme_Keyword: Blue River
Theme_Keyword: Blue River graben
Theme_Keyword: Williams Range thrust fault
Theme_Keyword: Proterozoic rocks
Theme_Keyword: Cretaceous rocks
Theme_Keyword: Williams Fork Mountains
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: USA
Place_Keyword: Colorado
Place_Keyword: Summit County
Place_Keyword: Grand County
Place:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4
Place_Keyword: f08117 = Summit
Place_Keyword: f08049 = Grand
Stratum:
Stratum_Keyword_Thesaurus: none
Stratum_Keyword: Morrison
Stratum_Keyword: Dakota
Stratum_Keyword: Benton
Stratum_Keyword: Niobrara
Stratum_Keyword: Pierre
Access_Constraints: none
Use_Constraints:
none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
Browse_Graphic:
Browse_Graphic_File_Name: http://pubs.usgs.gov/mf/2002/mf-2390/mf-2390.gif
Browse_Graphic_File_Description: Reduced-size image of the map sheet, 288x305 pixels, 44k bytes.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: http://pubs.usgs.gov/mf/2002/mf-2390/downloads/mf-2390.pdf
Browse_Graphic_File_Description: Printable representation of map layout, 5.3 MB.
Browse_Graphic_File_Type: PDF
Data_Set_Credit:
A.M. Licamelli, R.G. Kuehn, K.S. Morgan contributed to the compilation of this map.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Data was entered and checked by the geologist who made the observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed. This map was thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.
Logical_Consistency_Report:
Map elements were visually checked by the author for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ARC/INFO) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. The map was reviewed by two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards.
Completeness_Report:
Data is complete: no features were eliminated or generalized. Unit properties are described in the text explanation.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Lines were primarily mapped by ground investigation and photointerpretation of 1:24,000-scale color aerial photographs. These lines were digitized from the topographic field sheets and from annotated aerial photographs. Most digitized positions on the map are estimated to have about 20 m horizontal accuracy. Additional point observations were added using positions determined by a Rockwell PLGR-96 GPS unit with horizontal accuracy of about 10 meters. There is no elevation data in the database.
Lineage:
Process_Step:
Process_Description: Field geologic mapping
Process_Date: 1996 - 1997
Process_Step:
Process_Description:
Polygons, lines, and points representing geologic features and data points were digitized from scale-stable compilation materials using the GSMCAD public domain program (USGS Open-File Report 96-007).
Process_Date: 1999
Process_Step:
Process_Description:
The map data were exported to ARC/INFO using the GSMCAD export function to create ARC generate ASCII files. The ASCII files were then imported into ArcInfo using the GENERATE routine, and polygon topology built.
Process_Date: 1999
Process_Step:
Process_Description:
The gsmdraw.aml program was used in ARC to produce a graphics file of the colored map. In addition an explanation sheet was produced that includes a correlation of map units diagram, a list of map unit names and corresponding symbols, and an explanation of graphical map symbols.
Process_Date: 1999
Process_Step:
Process_Description:
Text map unit descriptors were added to the .AAT and .PAT database files for each coverage.
Process_Date: 2000
Process_Step:
Process_Description:
Draft check plots of the geologic map and explanation were created and submitted for peer review. Geologists reviewed the plots for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Revisions were made to the geospatial database as needed.
Process_Date: 2000
Process_Step:
Process_Description:
The database files, metadata, and check plots were edited by the USGS Central Publications Group, and revisions made to the geospatial database as needed.
Process_Date: 2000
Process_Step:
Process_Description:
The geospatial database files and metadata were quality checked for completeness and consistency.
Process_Date: 2000
Process_Step:
Process_Description:
Final preparation of the geospatial database for distribution, and preparation of map-on-demand files and metadata.
Process_Date: 2000
Process_Step:
Process_Description: Creation of original metadata record
Process_Date: 20090608
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Karl Kellogg
Contact_Organization: U.S. Geological Survey, CR
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 913
Box 25046, Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: 303-236-1305
Contact_Facsimile_Telephone: 303-236-0214
Contact_Electronic_Mail_Address: kkellogg@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Polyconic
Polyconic:
Longitude_of_Central_Meridian: -105.5
Latitude_of_Projection_Origin: 0.0
False_Easting: 0.000
False_Northing: 0.000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 20
Ordinate_Resolution: 20
Planar_Distance_Units: METERS
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:
---------------------------------------------------------------
COVERAGE NAME: dillonpoly
---------------------------------------------------------------

USER-DEFINED ITEMS IN DILLONPOLY.PAT:
------------------------------------

ATTRIBUTE NAME: DESCRIPTION
DATABASE ITEM STRUCTURE: 80,80,C,0
DESCRIPTION: Short textual description of the map unit. Complete
  descriptions of the map units are normally provided in an accompanying
  report. This description is typically shown on the legend printed on the
  map sheet.
ATTRIBUTE NAME: LABEL
DATABASE ITEM STRUCTURE: 6,6,C,0
DESCRIPTION: Map unit label.

ATTRIBUTE NAME: SYMBOL
DATABASE ITEM STRUCTURE: 4,4,I,0
DESCRIPTION: Integer index of the proper color for this polygon.  The index
  indicates which element of the shade set color524.shd is used.

CORRELATION OF ITEMS SYMBOL, LABEL, AND DESCRIPTION IN DILLONPOLY.PAT:

SYMBOL   LABEL  DESCRIPTION
0               water
2        Qal    alluvium
12       Qcl    colluvium and loess, undivided
16       Qls    younger landslide deposits
23       Qg     terrace gravel
25       Qac    alluvium and colluvium, undivided
26       Qt     talus
29       Xdi    diorite and quartz diorite
32       Qf     fan deposits
35       Qop    Pinedale outwash gravel
35       Qop?   Pinedale outwash gravel, uncertain
64       Xgr    granodiorite and quartz monzonite
75       Xbg    biotite gneiss
88       YXggp  granitic rocks, biotite gneiss, and pegmatite
98       QTgm   gravel of Mesa Cortina
102      Xsg    biotite-muscovite-sillimanite gneiss and schist
112      Qtb    Bull Lake till
115      Qtp    Pinedale till
150      YXpg   pegmatite and granite complex
156      YXp    pegmatite
222      Xqz    quartzite
334      Xam    amphibolite
367      Kpm    Pierre Shale, shale and sandstone member
371      Kb     Benton Shale
411      Kps    Pierre Shale, sandstone member
416      Kp     Pierre Shale, undivided
417      Kpl    Pierre Shale, lower shale member
427      Jm     Morrison Formation
440      Kn     Niobrara Formation
444      QTd    diamicton
449      QTls   older landslide deposits
454      Kd     Dakota Sandstone
455      Qgo    older outwash gravel
456      Qr     rock-glacier deposits
468      Xkbg   microcline-biotite gneiss
496      Qdf    debris-flow deposit
504      Xbmg   biotite-muscovite gneiss and schist
514      af     artificial fill
520      Xmg    migmatite

USER-DEFINED ITEMS IN DILLONPOLY.AAT:
------------------------------------

ATTRIBUTE NAME: DESCRIPTION
DATABASE ITEM STRUCTURE: 80,80,C,0
DESCRIPTION: Text indicating the type of linear geologic feature.

ATTRIBUTE NAME: SYMBOL
DATABASE ITEM STRUCTURE: 3,3,I,0
DESCRIPTION: Integer index of the line type used for plotting the feature
  on the map.  The symbol set used to plot these features is geol_sfo.lin.

CORRELATION OF ITEMS SYMBOL AND DESCRIPTION IN DILLONPOLY.AAT:

SYMBOL   DESCRIPTION
0        water boundary
1        contact
2        contact, approximately located
4        contact, concealed
14       thrust fault
20       thrust fault, approximately located
24       thrust fault, concealed
50       normal fault
173      map boundary
176      fault, concealed
176      normal fault, concealed
183      normal fault, approximately located
184      normal fault, concealed
216      fault, approximately located
227      fault

---------------------------------------------------------------
COVERAGE NAME: dillonline
---------------------------------------------------------------

USER-DEFINED ITEMS IN DILLONLINE.AAT:
------------------------------------

ATTRIBUTE NAME: DESCRIPTION
DATABASE ITEM STRUCTURE: 80,80,C,0
DESCRIPTION: Text indicating the type of linear geologic feature.

ATTRIBUTE NAME: SYMBOL
DATABASE ITEM STRUCTURE: 3,3,I,0
DESCRIPTION: Integer index of the line type used for plotting the feature
  on the map.  The line type is given by the symbol set (whose
  name is specified in an accompanying attribute) and this
  index value.

ATTRIBUTE NAME: SYMSET
DATABASE ITEM STRUCTURE: 20,20,C,0
DESCRIPTION: Name of the symbol set containing the appropriate line
  style to be used for plotting this feature.  Text.

CORRELATION OF ITEMS SYMBOL, SYMSET, AND DESCRIPTION IN DILLONLINE.AAT:

SYMBOL  SYMSET         DESCRIPTION
11      geoscamp1.lin  scarp
15      geoscamp1.lin  sackung structure
60      geol_sfo.lin   anticline
63      geol_sfo.lin   anticline, concealed
92      geol_sfo.lin   plunging syncline
92      geol_sfo.lin   syncline
95      geol_sfo.lin   plunging syncline, concealed
95      geol_sfo.lin   syncline, concealed
173     geol_sfo.lin   cross-section line A-A'
173     geol_sfo.lin   cross-section line B-B'

---------------------------------------------------------------
COVERAGE NAME: dillonpoint
---------------------------------------------------------------

USER-DEFINED ITEMS IN DILLONPOINT.PAT:
------------------------------------

ATTRIBUTE NAME: DESCRIPTION
DATABASE ITEM STRUCTURE: 80,80,C,0
DESCRIPTION: Text indicating the type of geologic point feature.

ATTRIBUTE NAME: AZIMUTH
DATABASE ITEM STRUCTURE: 7,7,I,0
DESCRIPTION: Integer value in the range 0-359 indicating rotation of the
  point feature in the horizontal plane. In the case of bedding or jointing,
  this value indicates the strike.

ATTRIBUTE NAME: INCLINATION
DATABASE ITEM STRUCTURE: 5,5,I,0
DESCRIPTION: Integer value in the range 0-90 indicating the inclination from
  horizontal of the point feature. In the case of bedding or jointing,
  this value indicates the dip.

ATTRIBUTE NAME: SYMBOL
DATABASE ITEM STRUCTURE: 3,3,I,0
DESCRIPTION: Integer index of the point type used for plotting the feature
  on the map.  The point type is given by the symbol set (whose
  name is specified in an accompanying attribute) and this
  index value.

ATTRIBUTE NAME: SYMSET
DATABASE ITEM STRUCTURE: 20,20,C,0
DESCRIPTION: Name of the symbol set containing the appropriate symbol
  to be used for plotting this feature.  Text.

CORRELATION OF ITEMS SYMBOL, SYMSET, AND DESCRIPTION IN DILLONPOINT.PAT:

SYMBOL  SYMSET          DESCRIPTION
2       geoscamp2.mrk   strike and dip of inclined beds
53      plotter.mrk     sample locality for zircon age dating
81      geoscamp2.mrk   strike and dip of foliation
82      geoscamp2.mrk   vertical foliation
122     usgs.mrk        gravel pit
130     geoscamp2.mrk   bearing and plunge of lineation
Entity_and_Attribute_Detail_Citation:
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey Central Publications Group
Contact_Address:
Address_Type: mailing address
Address: MS 902, Box 25046 DFC
City: Lakewood
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5486
Resource_Description: USGS Miscellaneous Field Studies Map MF-2390
Distribution_Liability:
Although this digital spatial data 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 may be held liable for any damages resulting from its authorized or unauthorized use.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 8.1
Format_Information_Content: Geologic units and structural features
File_Decompression_Technique: GZIP compressed TAR file (Unix), ZIP archive (Windows)
Transfer_Size: 2.8
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: 1.0
Format_Information_Content: Geologic units and structural features
File_Decompression_Technique: GZIP compressed TAR file (Unix), ZIP archive (Windows)
Transfer_Size: 2.8
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20160205
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Midwest Area
Contact_Position:
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 954
12201 Sunrise Valley Dr
City: Reston
State_or_Province: VA
Postal_Code: 20192-0002
Country: USA
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Extensions:

This page is <https://geo-nsdi.er.usgs.gov/metadata/map-mf/2390/metadata.html>
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