Geologic Map of the Silt Quadrangle, Garfield County, Colorado

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

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 > GEOMORPHOLOGY > EOLIAN LANDFORMS/PROCESSES

Theme_Keyword: EARTH SCIENCE > LAND SURFACE > GEOMORPHOLOGY > FLUVIAL LANDFORMS/PROCESSES

Theme_Keyword: EARTH SCIENCE > LAND SURFACE > GEOMORPHOLOGY > TECTONIC LANDFORMS/PROCESSES

Theme_Keyword: EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > CONTOURS

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

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

Spatial_Reference_Information:

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:

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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:

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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

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