Identification_Information: Citation: Citation_Information: Originator: William J. Perry Originator: Ralph R. Shroba Originator: Robert B. Scott Originator: Florian Maldonado Publication_Date: 2003 Title: Geologic map of the Horse Mountain quadrangle, Garfield County, Colorado Edition: 1.0 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Miscellaneous Field Studies Map Issue_Identification: MF-2415 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/mf/2003/mf-2415 Description: Abstract: New 1:24,000-scale geologic map of the Horse Mountain 7.5' quadrangle, in support of the USGS Western Colorado I-70 Corridor Cooperative Geologic Mapping Project, summarizes available geologic information for the quadrangle. It provides new interpretations of the stratigraphy, structure, and geologic hazards in the area of the southwest flank of the White River uplift. Bedrock strata include the Paleocene and early Eocene Wasatch Formation down through Ordovician and Cambrian units into Precambrian hornblende tonalite. The Wasatch Formation includes the Shire, Molina and Atwell Gulch Members which are mapped separately. The underlying Upper Cretaceous Mesaverde Group is subdivided into the Willams Fork and Iles Formations. The Cameo-Fairfield clinker zone within the Williams Fork Formation is mapped separately. The Iles Formation includes the Rollins Sandstone Member at the top, mapped separately, and the Cozzette Sandstone and Corcoran Sandstone Members, which are undivided. The Mancos Shale consists of four members, an upper member, the Niobrara Member, the Juana Lopez Member, and a lower member, undivided. The Lower Cretaceous Dakota Sandstone, the Upper Jurassic Morrison Formation, and Jurassic Entrada Sandstone are mapped separately. The Lower Jurassic and Upper Triassic Glen Canyon Sandstone is mapped with the Entrada in the Horse Mountain Quadrangle. The upper Triassic Chinle Formation and the Lower Permian and Triassic(?) State Bridge Formation are present. The Pennsylvanian and Permian Maroon Formation is undivided. All the exposures of the Middle Pennsylvanian Eagle Valley Evaporite are diapiric, intruded into the Middle Pennsylvanian Eagle Valley Formation, which includes locally mappable limestone beds. The Lower and Middle Pennsylvanian Belden Formation and the Lower Mississippian Leadville Limestone are present. The Upper Devonian Chaffee Group consists of the Dyer Dolomite and the underlying Parting Quartzite, undivided. Locally, the Lower Ordovician Manitou Formation is mapped separately beneath the Chaffee. Elsewhere, Ordovician through Cambrian units, the Manitou and Dotsero Formations, underlain by the Sawatch Quartzite, are undivided. The southwest flank of the White River uplift is a late Laramide structure that is represented by the steeply southwest-dipping Grand Hogback, which is only present in the southwestern corner of the map area, and less steeply southwest-dipping older strata that flatten to nearly horizontal attitudes in the northern part of the map area. Between these two are a complex of normal faults, the largest of which dips southward placing Chafee dolostone and Leadville Limestone adjacent to Eagle Valley and Maroon Formations. Diapiric Eagle Valley Evaporite intruded close to the fault on the down-thrown side. Removal of evaporite by either flow or dissolution from under younger parts of the strata create structural benches, folds, and sink holes on either side of the normal fault. A prominent dipslope of the Morrison-Dakota-Mancos part of the section forms large slide blocks and mass movement deposits consisting of a chaos of admixed Morrison and Dakota lithologies. The major geologic hazard in the area consists of large landslides both associated with dip-slope slide blocks and the steep slopes of the Eagle Valley Formation and Belden Formation in the northern part of the map. Abandoned coal mines are present along the north face of the Grand Hogback in the lower part of the Mesaverde Group Purpose: This map was funded by the National Cooperative Geologic Mapping Program. The map is a product of the I-70 Urban Corridor Project. This corridor is experiencing rapid urban growth and geologic mapping is needed to aid in land development planning in order to address, avoid, or mitigate known and potential geologic hazards. Supplemental_Information: Map political location: Garfield County, Colorado Compilation scale: 1:24,000 Geology mapped: 1996-1998 Datafiles included in this dataset: horse_geol.e00 horse_pnt.e00 horse_geol(.shp) horse_pnt(.shp) horse_line (.shp) horsemtn_base.tif(.tfw) Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -107.875 East_Bounding_Coordinate: -107.750 North_Bounding_Coordinate: 39.750 South_Bounding_Coordinate: 39.625 Keywords: Theme: Theme_Keyword_Thesaurus: AGI Glossary of Geology Theme_Keyword: Geologic map Theme_Keyword: White River Uplift Theme_Keyword: Grand Hogback monocline Theme_Keyword: Cambrian to Paleogene (early Tertiary) sedimentary rock Theme_Keyword: Late Tertiary to Quaternary surficial deposits Theme_Keyword: Laramide deformation Theme_Keyword: Neogene evaporite deformation Theme_Keyword: Landslide hazards Place: Place_Keyword_Thesaurus: Board of Geographic Names Place_Keyword: USA Place_Keyword: Colorado Place_Keyword: Garfield County Place_Keyword: Horse Mountain Place_Keyword: Middle Rifle Creek Access_Constraints: None Use_Constraints: None. Acknowledgement of the U.S. Geological Survey would be appreciated. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: William J. Perry, Jr. Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing and physical address Address: MS 939, Box 25046 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-5767 Contact_Electronic_Mail_Address: wperry@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/mf/2003/mf-2415.pdf Browse_Graphic_File_Description: graphical representation of map Browse_Graphic_File_Type: Portable Document Format - PDF Data_Set_Credit: U.S. Bureau of Land Management, U.S. Forest Service, Colorado Geological Survey, Puma Paw Ranch Native_Data_Set_Environment: Windows_NT, 4.0, Intel ARC/INFO version 7.2.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data were entered by GIS technician and checked by the geologist that made the field 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. Logical_Consistency_Report: Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the author and by the GIS technician(s) that created the digital database. 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 at least two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards. Completeness_Report: Data are complete: no features that could be accurately represented at the compilation scale of 1:24,000 were eliminated or generalized. All geospatial database elements are attributed. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Lines were primarily positioned by photointerpretation of 1:24,000-scale color aerial photographs using a PG-2 photogrammetric plotter that rectified the position and transferred it to a basemap. Lines were digitized from the basemap using a digitizer tablet with resolution of 0.001 inch and most digitized positions on the map are estimated to have about 20 m horizontal accuracy. Lineage: Process_Step: Process_Description: Field mapping and compilation by color stereo photos on PG-2 plotter; transfer of data by geologist to stable-base greenline. Process_Date: 1997-2000 Process_Step: Process_Description: The map data were digitized in ARC/INFO and polygon topology built. Process_Date: 2000-2001 Process_Step: Process_Description: Text map unit descriptors were added to the .AAT and .PAT database files for each coverage. Process_Date: 2001 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: 2002 Process_Step: Process_Description: First draft of metadata created by Amy Zoller using FGDCMETA.AML ver. 1.2 05/14/98 Process_Date: 20020311 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: 2003 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Lambert Conformal Conic Lambert_Conformal_Conic: Standard_Parallel: 38.45 Standard_Parallel: 38.75 Longitude_of_Central_Meridian: -105.5 Latitude_of_Projection_Origin: 37.83 False_Easting: 0.00000 False_Northing: 0.00000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 10 Ordinate_Resolution: 10 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: DATASET CONSISTS OF 2 MAIN COVERAGES: (HORSE_GEOL, HORSE_PNT) ---------------------------------------------------------------------------------- Description of items: SYMBOL - unique number taken from shadeset color524.shd to color map unit polygons NAME - short geologic unit name DESCRIPTION - short geologic unit description COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXE 1 AREA 8 18 F 5 - 9 PERIMETER 8 18 F 5 - 17 HORSE_GEOL# 4 5 B - - 21 HORSE_GEOL-ID 4 5 B - - 25 SYMBOL 3 3 I - - 42 NAME 7 7 C - - 49 DESCRIPTION 100 100 C - - NAME SYMBOL DESCRIPTION af 8 Artificial fill (latest Holocene) Twa 222 Atwell Gulch Member of Wasatch Formation (Paleocene) Pb 513 Belden Formation (Middle and Lower Pennsylvanian) Kwfc 433 Cameo-Fairfield clinker zone in Williams Fork Formation (Upper Cretaceous) Dc 168 Chaffee Group (Upper Devonian) TRc 510 Chinle Formation (Upper Triassic) Qc 12 Colluvium (Holocene to middle? Pleistocene) Kicc 396 Corcoran and Cozette Sandstone Members of Iles Formation, undivided (Upper Cretaceous) Kd 454 Dakota Sandstone (Lower Cretaceous) Qd 55 Debris-flow deposits (Holocene to Late Pleistocene?) Pee 243 Eagle Valley Evaporite (Middle Pennsylvanian) Pev 241 Eagle Valley Formation (Middle Pennsylvanian) Jeg 363 Entrada Formation (Middle Jurassic) and Glen Canyon Sandstone (Lower Jurassic) Qg 459 Gravelly alluvium (late to middle Pleistocene) QTg 11 High-level gravelly alluvium (early Pleistocene or late Pliocene) Qls 16 Landslide deposits, undivided (Holocene to middle? Pleistocene) Ml 323 Leadville Limestone (Mississippian) Pevl 330 Limestone in Eagle Valley Formation (Pennsylvanian) Qlo 10 Loess (late and middle? Pleistocene) Km 491 Mancos Shale (Upper Cretaceous) Om 107 Manitou Formation (Lower Ordivician) PPm 320 Maroon Formation (Lower Permian to middle Pennsylvanian) Qcm 450 Mass-movement deposits (Holocene to middle? Pleistocene) Twm 72 Molina Member of Wasatch Formation (Eocene) Jm 427 Morrison Formation (Upper Jurassic) Qlso 449 Older landslide deposits (late and middle? Pleistocene) OCu 506 Ordovician and Cambrian Formations, undivided Qp 9 Pediment deposits (middle Pleistocene) Pgn 68 Proterozoic altered hornblende tonalitic gneiss Kir 400 Rollins Sandstone Member of Iles Formation (Upper Cretaceous) Kis 401 Shale member of Iles Formation (Upper Cretaceous) Qsw 4 Sheetwash deposits (Holocene and late Pleistocene) Tws 127 Shire Member of Wasatch Formation (Eocene) TRPs 372 State Bridge Formation (Lower Triassic and Permian) Qta 26 Talus (Holocene and Late Pleistocene) Qac 25 Undivided alluvium and colluvium (Holocene and late Pleistocene?) Tw 112 Wasatch Formation (lower Eocene and Paleocene) Qfy 32 Young fan alluvium (Holocene and late Pleistocene) Qlsy 73 Younger landslide deposits (Holocene and late Pleistocene?) Qlo/Qp 98 thin loess on pediment deposits (late and middle? Pleistocene) Kwfu 436 upper part of Williams Fork Formation (Upper Cretaceous) water 0 water body ------------------------------------------------------------------------------ Description of items: DESCRIPTION - short explanation of feature using digital cartographic standard COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 HORSE_GEOL# 4 5 B - - 29 HORSE_GEOL-ID 4 5 B - - 33 DESCRIPTION 100 100 C - - DESCRIPTION anticline - certain anticline - concealed contact - approximately located contact - certain contact - concealed fault - approximately located fault - certain fault - concealed intrusion contact - approximately located intrusion contact - certain intrusion contact - concealed map boundary normal fault - approximately located normal fault - approximately located, queried normal fault - certain normal fault - concealed reservoir boundary syncline - certain syncline - concealed thrust fault - concealed ------------------------------------------------------------------------------ Description of items: STRIKE - Compass direction of fault plane trend, in degrees (0 - 359) DIP - Angle of fault plane inclination, in degrees from horizontal (0 - 90) DESCRIPTION - short explanation of feature using digital cartographic standard COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 AREA 8 18 F 5 - 9 PERIMETER 8 18 F 5 - 17 HORSE_PNT# 4 5 B - - 21 HORSE_PNT-ID 4 5 B - - 25 STRIKE 4 4 I - S - 29 DIP 4 4 I - D - 33 DESCRIPTION 100 100 C - - DESCRIPTION horizontal bedding inclined bedding - showing strike and dip overturned bedding - showing strike and dip sample location 97P1 sample location 97P2 vertical bedding - showing strike well 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 and physical address Address: Central Publications Group Box 25046, Denver Federal Center, MS 902 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-5486 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, SHP File_Decompression_Technique: GZIP compressed TAR file(Unix), ZIP archive(Windows) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/mf/2003/mf-2415 Fees: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: USGS Information Services City: denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Resource_Description: MF-2415 (map-on-demand) Distribution_Liability: none Standard_Order_Process: Non-digital_Form: Available as one printed sheet plus one pamphlet. Order from USGS at the address listed above or see http://rmmcweb.cr.usgs.gov/public/mod/order.html for more ordering information. Fees: for current charges please see http://rmmcweb.cr.usgs.gov/public/mod/order.html Metadata_Reference_Information: Metadata_Date: 20020311 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: US Geological Survey Contact_Person: paco vansistine Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center USGS MailStop 980 City: denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-5452 Contact_Electronic_Mail_Address: dsistine@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: none