Geologic map of the Frisco quadrangle, Summit County, Colorado

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Kellogg, Karl S.
Originator: Bartos, Paul, J.
Originator: Williams, Cindy L.
Publication_Date: 2002
Title: Geologic map of the Frisco quadrangle, Summit County, Colorado
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
Issue_Identification: MF-2340
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/mf/2002/mf-2340/
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 Frisco quadrangle is near the headwaters of the Blue River and straddles features of the Blue River graben (Kellogg, K.S., 1999, Neogene basins of the northern Rio Grande rift—partitioning and asymmetry inherited from Laramide and older uplifts: Tectonophysics, v. 305, p. 141-152.), 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 the northeastern corner of the quadrangle.
The oldest rocks in the quadrangle underlie the Tenmile Range 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, Ogden, 1987, Rock units of the Precambrian- basement in Colorado: U.S. Geological Survey Professional Paper 1321-A, 54 p.). The oldest sedimentary unit is the Pennsylvanian Maroon Formation, a sequence of red sandstone, conglomerate, and interbedded shale. The thickest sequence of sedimentary rocks is Cretaceous in age and includes at least 500 m of the Upper Cretaceous Pierre Shale. The sedimentary rocks are intruded by sills and dikes of dacite porphyry sills of Swan Mountain, dated at 44 Ma (Marvin, R.F., Mehnert, H.H., Naeser, C.W., and Zartman, R.E., 1989, U.S. Geological Survey radiometric ages, compilation “C”—Part five—Colorado, Montana, Utah, and Wyoming: Isochron/West, no. 53, p. 14-19. Simmons, E.C., and Hedge, C.E., 1978, Minor-element and Sr-isotope geochemistry of Tertiary stocks, Colorado mineral belt: Contributions to Mineralogy and Petrology, v. 67, p. 379-396.). Surficial deposits include (1) an old, deeply dissected landslide deposit, possibly as old as Tertiary, on the south flank of Tenderfoot Mountain, (2) deeply weathered, very coarse gravel deposits, mostly along Gold Run and underlying Mesa Cortina; the gravels are gold bearing and were mined by hydraulic methods in the 1800's, (3) glacial deposits of both Bull Lake (middle Pleistocene) and Pinedale (late Pleistocene) that were derived from large valley glaciers that flowed down Tenmile and North Tenmile Creeks; the town of Frisco is underlain mostly by Pinedale-age glacial outwash, (4) recent landslide deposits, including one large (about 1 square kilometer) area just downslope from Lilly Pad Lake, west of I-70, and (5)extensive colluvial and alluvial deposits.
The latest seismic events appear to be middle Pliestocene in age and are associated with small scarps that cut Bull Lake till but do not cut Pinedale till.
Purpose:
To update and reinterpret earlier geologic mapping, and to achieve a uniform regional geologic database.
Supplemental_Information:
Compilation scale: 1:24,000
Geology mapped in 1997 and 1998.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
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: 39.612
South_Bounding_Coordinate: 39.50
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geology
Theme_Keyword: geologic maps
Theme_Keyword: bedrock geologic units
Theme_Keyword: surficial geologic units
Theme_Keyword: geologic structure
Theme_Keyword: geospatial datasets
Theme_Keyword: earthquake occurrences
Theme:
Theme_Keyword_Thesaurus: American Geological Institute (AGI) Glossary of Geology
Theme_Keyword: Geologic map
Theme_Keyword: Frisco, 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: Dillon Reservoir
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:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4
Place_Keyword: f08117 = Summit
Stratum:
Stratum_Keyword_Thesaurus: none
Stratum_Keyword: Maroon
Stratum_Keyword: Chinle
Stratum_Keyword: Entrada
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.
Point_of_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
Browse_Graphic:
Browse_Graphic_File_Name: http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340.gif
Browse_Graphic_File_Description:
Reduced-size image of the entire map sheet; 288x277 pixels, 42k bytes.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340.pdf
Browse_Graphic_File_Description:
Printable representation of map layout; includes correlation, cross sections, list of map units, and index maps, 3.6 megabytes.
Browse_Graphic_File_Type: PDF
Data_Set_Credit: A.M. Licamelli, R.G. Kuehn, K.S. Morgan
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 has been 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. A digital base map coverage is not included but is available separately.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Lines were primarily mapped by ground investigation and photo-interpretation 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 m. There is no elevation data in the database.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kellogg, Karl
Originator: Bartos, Paul
Originator: Williams, Cindy
Title: unpublished mapping done in 1997 and 1998
Publication_Date: (unpublished)
Type_of_Source_Media: greenline mylar topographic base map
Source_Time_Period_of_Content:
Source_Currentness_Reference: Geologic mapping was done in 1997 and 1998
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1997
Ending_Date: 1998
Source_Citation_Abbreviation: Kellogg and others (2002)
Source_Contribution: This data was used to compile the geologic map.
Process_Step:
Process_Description:
The Frisco geologic database was compiled using the GSMCAD public domain program (USGS Open-File Report 96-007 ). It was exported to ARC/INFO using the GSMCAD export function to create ARC generate ASCII files and the gsmarc.aml program in ARC was used to convert the ASCII files to ARC coverages and build polygons. The compilation was completed November, 1999. The review and revision was completed April, 2000. Archive files prepared June 2002.
Process_Date: 2002
Process_Step:
Process_Description: Creation of original metadata record
Process_Date: 20090709
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Karl S. Kellogg
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: MS 913, Box 25046 DFC
City: Lakewood
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-1305
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: 38.45
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:
The data is supplied in ARC/INFO export and shape file formats.
DATABASE STRUCTURE - ARC/INFO ====================================
The database of the map consists of coverages, including corresponding INFO files:
friscopoly2 coverage: Contains all contact lines and labelpoints for each polygon. In the coverage's friscopoly2.aat INFO file the CODE item provides a numeric code that specifies the geologic identity and positional quality of each contact line (e.g., fault, approximately located), and the P1 and P2 items are relic cartographic parameters from the GSMCAD compilation program. The friscopoly2.aat CODE values are defined below. In the friscopoly2.pat INFO file the CODE and P2 items are relic cartographic parameters from the GSMCAD program, the P1 item provides a numeric code that specifies the polygon's map unit identity, the TEXT item indicates the map unit label for each polygon, and the SYMBOL item defines the polygon color as chosen from the color524.shd shadeset (included in bundled file archive). The friscopoly2.pat P1 and TEXT items are listed below.
friscoline2 coverage: Contains faults, fold axes, and other non-contact lines. Faults that are contacts also appear in the friscopoly2 coverage. In the friscoline2.aat INFO file the CODE item provides a numeric code that specifies the geologic identity and positional quality for each type of line, the P1 and P2 items are relic cartographic parameters from the GSMCAD program, and the TEXT item describes the geologic identity, positional quality, and, in some cases, additional aspects of each line. The friscoline2.aat CODE and TEXT items are listed below.
friscopoint2 coverage: Contains points used for cartographically decorating lines, such as "ball-and-bar" fault symbols, and teeth on thrust faults. In the INFO file friscopoint2.pat the CODE item defines a numeric code for each type of point decoration and the P1 and P2 items indicate the orientation (or strike azimuth) and, where appropriate, dip (or plunge) value associated with each point symbol. The friscopoint2.pat CODE items are listed below.
Auxiliary files:
color524.shd: This shadeset file defines the rgb values of colors assigned to polygons in the friscopoly2 coverage (see SYMBOL item).
Readme.doc: Disclaimer and list of included files.
Map unit labels listed here with associated numeric codes. Unit names and fuller descriptions of the units are in the explanatory pamphlet accompanying the map and data files.
P1  | GEOLOGIC MAP UNIT LABELS
205 | af
207 | dt
148 | Qal
165 | Qs
164 | Qav
163 | Qry
161 | Qr
176 | Qtr
147 | Qf
162 | Qt
101 | Qc
100 | Qac
155 | Qls
152 | Qg
206 | Qop
200 | Qtp
201 | Qtb
204 | Qgo
210 | Qgm
202 | Qgg
175 | Qd
153 | QTls
220 | Tqp
233 | Kpm
232 | Kps
231 | Kpl
240 | Kn
242 | Kb
106 | Kd
104 | Jm
105 | Je
107 | TrPcm
162 | Xu
266 | Xgg
264 | Xgd
259 | Xmg
263 | Xhpg
250 | Xbg
255 | YXp
257 | Yxdi
262 | YXu
265 | Xum
DEFINITION OF CODES IN THE DATABASE COVERAGES (CODES AND TEXT LISTED IN THE .AAT AND .PAT FILES)
CODE |  TEXT (DEFINITION)
  1  | contact; certain
  2  | contact; approximately located
  3  | contact; concealed
 11  | fault; certain
 12  | fault; approximately located
 13  | fault; concealed
 21  | normal fault; certain
 22  | normal fault; approximately located
 23  | normal fault; concealed
 31  | thrust fault; certain; upthrown on right side
 32  | thrust fault; approximate location; upthrown on right side
 33  | thrust fault; concealed; upthrown on right side
 41  | reverse fault; certain
 42  | reverse fault; approximately located
 43  | reverse fault; concealed
 51  | syncline axis; certain
 52  | syncline axis; concealed
 61  | anticline axis; certain
 62  | anticline axis; concealed
 65  | strike-slip arrows
 71  | dike or sill
 72  | quartz vein
 93  | water boundary
 94  | scratch contact
 95  | cross-section line
 99  | map boundary
200  | plunge arrow
201  | bedding attitude (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
202  | strike and dip foliation symbol
203  | plunge and bearing (lineation)symbol
204  | anticline arrows(P1=orientation azimuth)
205  | syncline arrows(P1=orientation azimuth)
207  | bar and ball symbol(P1=orientation azimuth)
208  | dip symbol on contact or fault (P1=strike azimuth, P2=dip angle)
209  | left-lateral arrows (P1=orientation azimuth)
210  | right-lateral arrows(P1=orientation azimuth)
213  | strike and dip of joints symbol (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
217  | fold plunge arrow symbol(P1=orientation azimuth)
219  | strike and dip of overturned beds symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
220  | strike and dip, approximate (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
221  | vertical bed symbol(P1=orientation azimuth)
222  | vertical foliation symbol(P1=orientation azimuth)
230  | vertical joint symbol(P1=orientation azimuth)
246  | strike with undetermined dip symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
251  | strike and dip of foliation symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
500  | Unit labels text & tag
501  | Hidden unit tags
502  | rock text
510  | ordinary text
701  | Splined text
Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340pam.pdf

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey Information Services
Contact_Address:
Address_Type: mailing address
Address: Box 25286 Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States
Contact_Voice_Telephone: 1-888-ASK-USGS
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: 7.1.2
Format_Information_Content: Geologic units and structural features
File_Decompression_Technique: gzip -d and tar or unzip
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 -d and tar or unzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20160610
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


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