Identification_Information: Citation: Citation_Information: Originator: Jeremiah B. Workman Originator: William A. Braddock Publication_Date: 2010 Title: Geologic Map of the Sand Creek Pass Quadrangle, Larimer County, Colorado and Albany County, Wyoming Edition: version 1.0 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: USGS Scientific Investigations Map Issue_Identification: 3133 Publication_Information: Publication_Place: Denver, Colorado, U.S.A. Publisher: United States Geological Survey Online_Linkage: http://pubs.usgs.gov/sim/3133/ Description: Abstract: This geologic map provides new geologic mapping at 1:24,000-scale in the Sand Creek Pass 7.5 minute quadrangle south of Laramie, WY in the northern Front Range of Colorado. Purpose: These data represent new geologic mapping which can be used in land-use planning, hazards analysis, resource assessments, and other geologic framework studies. Supplemental_Information: Datasets included in this geospatial database: scpgeo: polygon features of geologic units, contacts, and faults scpfld: arc features of fold axes scpatt: point features of bedding, foliation, and lineament attitudes Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2010 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -105.8750000 East_Bounding_Coordinate: -105.7500000 North_Bounding_Coordinate: 41.0000000 South_Bounding_Coordinate: 40.8750000 Keywords: Theme: Theme_Keyword_Thesaurus: American Geological Institute Glossary of Geology Theme_Keyword: Geologic map Theme_Keyword: Proterozoic rocks Theme_Keyword: Paleozoic rocks Theme_Keyword: Mesozoic rocks Theme_Keyword: Cenozoic rocks Theme_Keyword: Quaternary deposits Theme_Keyword: Sheep Creek fault zone Theme_Keyword: Boulder Ridge fault zone Theme_Keyword: Cornelius Creek shear zone Theme_Keyword: Panhandle Creek shear zone Theme_Keyword: East Jimmy Creek fault Theme_Keyword: West Jimmy Creek fault Theme_Keyword: Shell Creek fault Theme_Keyword: Shell Creek anticline Theme_Keyword: East Bull Mountain syncline Theme_Keyword: Rawah batholith Theme_Keyword: Log Cabin batholith Theme_Keyword: Sherman Granite Place: Place_Keyword_Thesaurus: U.S. Board of Geographic Names (BGN) Geographic Names Information System (GNIS) Place_Keyword: USA Place_Keyword: United States of America Place_Keyword: Colorado Place_Keyword: Front Range Place_Keyword: Sand Creek Pass Place_Keyword: Laramie Mountains Place_Keyword: Boulder Ridge Place_Keyword: Bull Mountain Place_Keyword: Shell Creek Place_Keyword: Sand Creek Place_Keyword: Dry Creek Place_Keyword: Jimmy Creek Place_Keyword: Larimer County Place_Keyword: Albany County Place_Keyword: Sand Creek Pass Road Place_Keyword: Boulder Ridge Road Place_Keyword: Roosevelt National Forest Access_Constraints: None Use_Constraints: None. Users of this geospatial database and geologic information derived from it should acknowledge the U.S. Geological Survey as the source of the data. Although software enables a user to display images at various scales, map data in this report should not be used at scales greater than 1:24,000. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jeremiah B. Workman Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: MS 980, Box 25046 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1257 Contact_Facsimile_Telephone: 303-236-0214 Contact_Electronic_Mail_Address: jworkman@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/sim/3133/downloads/pdf/sim_3133.pdf Browse_Graphic_File_Description: graphic representation of map layout Browse_Graphic_File_Type: PDF Data_Set_Credit: Geologic mapping in the field and from imagery completed by Jeremiah B. Workman and William A. Braddock, and all digital compilation of database, as well as unit descriptions and figures was completed by Jeremiah B. Workman. Final map layout was completed by Gayle Dumonceaux. Native_Data_Set_Environment: Windows_XP, Intel ARC/INFO version 9.2 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data were checked by the geologist that made the field observations and compilation. The attributes of this geospatial dataset consist of text identifiers and numbers that indicate the identity of the geologic unit or type of geologic feature, and values for orientations measured in the field. To check the attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial data set 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. Logical_Consistency_Report: Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the author. Automated (ArcInfo) 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. Check plots of the map were reviewed by other geologistsand a cartographer for consistency with basic geologic principles and general conformity to USGS mapping standards. All areas of the map were compiled at a consistent scale and level of accuracy. Completeness_Report: Data are complete. No features that could be accurately represented at a scale of 1:24,000 were eliminated or generalized. The smallest features represented are approximately 10 meters on a side. All geospatial database elements are attributed. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Digitized positions on the map that depict distinct contacts between rock formations in the field labeled as certain and all point observations are estimated to be within 20 meters of the actual contact on the land. Horizontal positional accuracy was constrained in the field by use of a Garmin GPSmap 76CSx handheld GPS device which produced average accuracy below 20 meters. Features labeled as approximately located are of uncertain positional accuracy. Accuracy of these digital data indirectly depends on accuracy of the base maps on which the original field 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. The database contains no elevation data. Lineage: Process_Step: Process_Description: William A. Braddock conducted reconnaisance geologic mapping by field observation in combination with analysis of aerial photographs. Process_Date: 1981 Process_Step: Process_Description: Jeremiah B. Workman mapped the geology by field observation in combination with analysis of aerial photographs, satellite imagery, and digital elevation model data. Process_Date: 2006 to 2008 Process_Step: Process_Description: The geology linework for the map was compiled onto USGS published 1:24,000-scale base maps. Process_Date: 2008 Process_Step: Process_Description: Compilation maps were scanned, registered, and rectified and linework digitized and attributed on screen in Arc Workstation. Process_Date: 2008 Process_Step: Process_Description: Attitude point data were compiled from field notes containing location information recorded from a handheld GPS device. These data were entered into tables which were converted to an ArcInfo point coverage. Process_Date: 2008 Process_Step: Process_Description: Technical reviews were provided by Karl Kellogg (USGS), Alan VerPloeg (WyoGS), and Richard Jones (WyoGS). Process_Date: 2009 Process_Step: Process_Description: Metadata document prepared by Jeremiah B. Workman. Database reviewed for conformity with USGS standards by Kenzie Turner (USGS). Process_Date: 2009 Process_Step: Process_Description: Copy edit review provided by Gayle Dumonceaux (USGS). Process_Date: 2009 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 5 Ordinate_Resolution: 5 Planar_Distance_Units: METERS Map_Projection: Map_Projection_Name: Polyconic Polyconic: Latitude_of_Projection_Origin: 0 Longitude_of_Central_Meridian: -105.81250 False_Easting: 0.00000 False_Northing: 0.00000 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 database was compiled in ArcEdit as three ArcInfo >coverages. These coverages have been converted to shapefiles >which are also included with the published dataset. The >following description applies to the ArcInfo coverages, but may >also be used for the shapefiles with the primary difference >being file names have been shortened (the 'SCP' prefix has >been dropped) and a suffix indicating feature type was added >("_arc", "_point", "_label", or "_polygon"), which also affects >the non-user-defined attributes. Some item names may >have been truncated to conform to shapefile standards, and the >polygon coverage 'SCPGEO' which contains both arc and polygon >attributes has been split into three separate sets of shapefiles >containing arcs, label points, and polygons. > >The database contains the following three ArcInfo coverages: > >------------------------------------------------------------ >---- COVERAGE NAME ---- ENTITY TYPE ---- DESCRIPTION ------- >------------------------------------------------------------ >- SCPGEO -- Polygons -- Rock unit areas >- Lines -- Rock unit boundaries > (contacts; faults) >------------------------------------------------------------ >- SCPFLD -- Lines -- Linear geologic > features (fold axes) >------------------------------------------------------------ >- SCPATT -- Point -- Point observations > (bedding, foliation and > lineament attitudes) >------------------------------------------------------------ > >------------------------------------------------------------ >Database structure of SCPGEO.PAT: >------------------------------------------------------------ > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 SCPGEO# 4 5 B - > 21 SCPGEO-ID 4 5 B - > 25 UNIT 8 8 C - > 33 DESCRIPTION 250 250 C - > >Description of user-defined database items in SCPGEO.PAT > UNIT: Abbreviated name of map unit (TR=Triassic; lP=Pennsylvanian) > DESCRIPTION: Name of map unit and geologic age (see map pamphlet > for more detailed description) > >Unique item values for SCPGEO.PAT >-- UNIT-- DESCRIPTION--------------------------------------- > Qa Alluvium (Holocene) > Qac Alluvium and colluvium, undivided (Holocene to middle? > Pleistocene) > Qc Colluvium (Holocene to middle? Pleistocene) > Qls Landslide deposit (Holocene to middle? Pleistocene) > Qp Pediment deposits (middle Pleistocene) > Kb Benton Group (Upper and Lower Cretaceous) > Kd Dakota Group (Lower Cretaceous) > Jm Morrison Formation (Upper Jurassic) > JTRsj Sundance Formation (Upper and Middle Jurassic) and Jelm > Formation of Chugwater Group (Upper Triassic), undivided > TRPrgu Red Peak Formation of Chugwater Group (Lower Triassic) and > upper part of Goose Egg Formation (Lower Triassic and Upper > Permian), undivided > Pgf Forelle Limestone Member (Upper Permian) of Goose Egg Formation > Pgsu Upper part of Satanka Shale Member (Upper and Lower Permian) of > Goose Egg Formation > Pgsl Lower part of Satanka Shale Member (Lower Permian) of Goose Egg > Formation > PlPc Casper Formation (Lower Permian to Middle Pennsylvanian) > lPf Fountain Formation (Middle to Lower Pennsylvanian) > Yd Mafic dikes (Mesoproterozoic) [line feature only] > YXp Pegmatite (Mesoproterozoic? and Paleoproterozoic) > YgSH Sherman Granite (Mesoproterozoic) > Yghp Porphyritic hornblende monzogranite (Mesoproterozoic?) > XgR Granite of Rawah batholith (Paleoproterozoic) > Xfl Leucocratic felsic gneiss (Paleoproterozoic) > Xh Hornblende gneiss and amphibolite (Paleoproterozoic) > fz fault zone > > >------------------------------------------------------------ >Database structure of SCPGEO.AAT: >------------------------------------------------------------ > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC > 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 SCPGEO# 4 5 B - > 29 SCPGEO-ID 4 5 B - > 33 DESCRIPTION 100 100 C - > >Description of user-defined database items in SCPGEO.AAT > DESCRIPTION: Line type as defined in Digital Cartographic > Standards > >Unique item values for SCPGEO.AAT >--- DESCRIPTION ---------------------------------------- > contact-approximately located > contact-certain > dike-Yd > fault zone-approximately located > fault zone-certain > fault-approximately located > fault-certain > fault-concealed > map boundary > > >------------------------------------------------------------ >Database structure of SCPFLD.AAT: >------------------------------------------------------------ > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC > 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 SCPFLD# 4 5 B - > 29 SCPFLD-ID 4 5 B - > 33 DESCRIPTION 100 100 C - > >Description of user-defined database items in SCPFLD.AAT > DESCRIPTION: Line type as defined in Digital Cartographic > Standards > >Unique item values for SCPFLD.AAT >--- DESCRIPTION -------------------- > anticline > syncline > > >------------------------------------------------------------ >Database structure of SCPATT.PAT: >------------------------------------------------------------ > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 SCPATT# 4 5 B - > 21 SCPATT-ID 4 5 B - > 25 STRIKE 2 5 B - > 27 DIP 2 5 B - > 29 DESCRIPTION 100 100 C - > >Description of user-defined database items in SCPATT.PAT > STRIKE: Azimuth of strike for planar features or trend > for linear features > DIP: angle in degrees from horizontal of dip for planar > features or plunge for linear features > DESCRIPTION: Point type as defined in Digital Cartographic > Standards > >Unique item values for SCPATT.PAT >--- DESCRIPTION ---------------------------- > inclined bedding-showing strike and dip > horizontal bedding > inclined foliation in metamorphic rocks-showing strike and dip > vertical foliation in metamorphic rocks-showing strike > lineation-showing trend and plunge > lineation on fault surface-showing trend and plunge > fault surface-showing direction and value of dip >--- STRIKE ----------------------- > 0 to 359 >--- DIP -------------------------- > 0 to 90 > >------------------------------------------------------------ Entity_and_Attribute_Detail_Citation: None 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 Address: Enterprise Publishing Network Address: MS 902 Box 25046 Address: Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Contact_Voice_Telephone: 1-303-236-5486 Resource_Description: SIM-3133 Distribution_Liability: This database, identified as SIM-3133, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE,SHP Format_Version_Number: 9.2 Format_Version_Date: 2005 File_Decompression_Technique: ZIP archive Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/3133/ Fees: None 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 Address: Information Services Address: Box 25286 Address: Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Resource_Description: Scientific Investigations Map 3133 (Map-on-Demand) Distribution_Liability: This database, identified as SIM-3133, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on 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: Non-digital_Form: Available as one printed sheet Order from USGS at address above or see for more ordering information. Fees: For current prices see: Metadata_Reference_Information: Metadata_Date: 2010 Metadata_Review_Date: 2010 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jeremiah B. Workman Contact_Organization: U.S. Geological Survey 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: 303-236-1257 Contact_Electronic_Mail_Address: jworkman@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998