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: http://pubs.usgs.gov/mf/2002/mf-2390/downloads/mf-2390pam508.pdf 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: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2390/downloads/MF2390.tar.gz Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2390/downloads/MF2390.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 compressed TAR file (Unix), ZIP archive (Windows) Transfer_Size: 2.8 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2390/downloads/MF2390.tar.gz Network_Resource_Name: http://pubs.usgs.gov/mf/2002/mf-2390/downloads/MF2390.zip 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: Online_Linkage: http://geology.usgs.gov/tools/metadata/tools/ext/parts.ext