Geologic Map of the Silt Quadrangle, Garfield County, Colorado

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Ralph R. Shroba; Robert B. Scott
Publication_Date: 2001
Title: Geologic Map of the Silt Quadrangle, Garfield County, Colorado
Edition: 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name:
Issue_Identification: U.S. Geological Survey Miscellaneous Field Studies Map
Publication_Information:
Publication_Place: Denver, Colorado, USA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Online_Linkage: http://pubs.usgs.gov/mf/2001/mf-2331/
Description:
Abstract:
To update and reinterpret earlier geologic mapping, and to provide sufficient geologic information for land-use decisions. New 1:24,000-scale geologic mapping in the Silt 7.5' quadrangle, in support of the USGS Western Colorado I-70 Corridor Cooperative Geologic Mapping Project, provides new interpretations of the stratigraphy, structure, and geologic hazards in the area of the southwest flank of the White River uplift, the Grand Hogback, and the eastern Piceance Basin. The Wasatch Formation was subdivided into three formal members, the Shire, Molina, and Atwell Gulch Members. Also a sandstone unit within the Shire Member was broken out. The Mesaverde Group consists of the upper Williams Fork Formation and the lower Iles Formation. Members for the Iles Formation consist of the Rollins Sandstone, the Cozzette Sandstone, and the Corcoran Sandstone Members. The Cozzette and Corcoran Sandstone Members were mapped as a combined unit. Only the upper part of the Upper Member of the Mancos Shale is exposed in the quadrangle. From the southwestern corner of the map area toward the northwest, the unfaulted early Eocene to Paleocene Wasatch Formation and underlying Mesaverde Group gradually increase in dip to form the Grand Hogback monocline that reaches 45-75 degree dips to the southwest (section A-A'). The shallow west- northwest-trending Rifle syncline separates the northern part of the quadrangle from the southern part along the Colorado River. Geologic hazards in the map area include erosion, expansive soils, and flooding. Erosion includes mass wasting, gullying, and piping. Mass wasting involves any rock or surficial material that moves downslope under the influence of gravity, such as landslides, debris flows, or rock falls, and is generally more prevalent on steeper slopes. Locally, where the Grand Hogback is dipping greater than 60 degrees and the Wasatch Formation has been eroded, leaving sandstone slabs of the Mesa Verde Group unsupported over vertical distances as great as 500 m, the upper part of the unit has collapsed in landslides, probably by a process of beam-buckle failure. In the source area of these landslides strata are overturned and dip shallowly to the northeast. Landslide deposits now armor Pleistocene pediment surfaces and extend at least 1 km into Cactus Valley. Gullying and piping generally occur on more gentle slopes. Expansive soils and expansive bedrock are those unconsolidated materials or rocks that swell when wet and shrink when dry. Most floods are restricted to low-lying areas. Several gas-producing wells extract methane from coals from the upper part of the Iles Formation. Map political location: Garfield County, Colorado Compilation scale: 1:24,000 Geology mapped in 1992 to 1996. Compilation completed March 1997.
Purpose:
Not Available
Supplemental_Information:
Not Available
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -107.75
East_Bounding_Coordinate: -107.625
North_Bounding_Coordinate: 39.625
South_Bounding_Coordinate: 39.5
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > RIVERS/STREAMS
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > EROSION/SEDIMENTATION > SEDIMENTS
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > EROSION/SEDIMENTATION > STRATIGRAPHIC SEQUENCE
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > AEOLIAN PROCESSES
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > FLUVIAL PROCESSES
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > TECTONIC PROCESSES
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > CONTOUR MAPS
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > LANDFORMS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > AEOLIAN LANDFORMS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > FLUVIAL LANDFORMS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > TECTONIC LANDFORMS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > BEDROCK LITHOLOGY
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > IGNEOUS ROCKS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTARY ROCKS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS > FAULT MOVEMENT
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS > FOLDS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS > STRATIGRAPHIC SEQUENCE
Theme_Keyword: MAPS
Theme_Keyword: Geologic Cross Section
Theme_Keyword: Geology
Theme_Keyword: Geologic Maps
Theme_Keyword: Cretaceous To Tertiary Sedimentary Rocks
Theme_Keyword: Quaternary To Tertiary Surficial Deposits
Theme_Keyword: Laramide Compressional Deformation
Theme_Keyword: Geologic Hazards
Theme_Keyword: Wasatch Formation
Theme_Keyword: Mesaverde Group
Theme_Keyword: Williams Fork Formation
Theme_Keyword: Iles Formation
Theme_Keyword: Mancos Shale
Theme_Keyword: Colorado
Theme_Keyword: Garfield County
Theme_Keyword: Silt Quadrangle
Theme_Keyword: Silt Quad
Theme_Keyword: ELEVATION
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > COLORADO > GARFIELD COUNTY
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://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/mf-2331.gif
Browse_Graphic_File_Description:
Graphic representation of map layout, 400x422 pixels 24-bit color.
Browse_Graphic_File_Type: GIF
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DOI/USGS/GD/PUBS/CR > Central Region, Publications, Geology Division, U.S. Geological Survey, U.S. Department of the Interior
Contact_Person: U.S. GEOLOGICAL SURVEY CENTRAL PUBLICATIONS GROUP
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Denver Federal Center
Address: MS-902
Address: Box 25046
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: (303) 236-5486
Resource_Description: USGS Miscellaneous Field Studies Map MF-2331
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Arc/Info export files and ArcView shapefiles
Transfer_Size: 3 megabytes
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://cpg.cr.usgs.gov/pub/publications.html
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/open-file-reports...
Access_Instructions:
USGS Open-File Report, Preliminary Geologic Map of the SILT Quadrangle, Garfield County, Colorado by Ralph R. Shroba, George M. Farier, and Morris W. Green, publishied in 1994.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/m...
Access_Instructions:
Map in PDF (2.8 megabytes)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/m...
Access_Instructions:
GZIPPED TAR archive of ArcInfo files, metadata, etc. (3 MB)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/m...
Access_Instructions:
ZIPPED archive of ArcInfo files, metadata, etc. (3 MB)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/s...
Access_Instructions:
ZIPPED archive of georeferenced image files of base map (4 MB)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/m...
Access_Instructions:
Metadata in TEXT format (30 KB)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/m...
Access_Instructions:
Metadata in HTML format (39 KB)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2331/
Access_Instructions:
Fees: None
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Metadata_Reference_Information:
Metadata_Date:
Metadata_Review_Date: 20041007
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: RALPH R. SHROBA
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: U.S. Geological Survey
Address: Box 25046, MS 913
Address: Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: 303-236-1292
Contact_Facsimile_Telephone: 303-236-0214
Contact_Electronic_Mail_Address: rshroba@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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