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: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2340/downloads/mf-2340.tar.gz Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2340/downloads/mf-2340.zip 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: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2340/downloads/mf-2340.tar.gz Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2340/downloads/mf-2340.zip 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