Identification_Information: Citation: Citation_Information: Originator: David J. Lidke Publication_Date: 2002 Title: Geologic map of the Eagle quadrangle, Eagle County, Colorado Edition: 1.0 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Miscellaneous Field Studies Map Issue_Identification: MF-2361 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: Description: Abstract: The Eagle quadrangle covers an area that straddles the Eagle River and Interstate 70 (I-70) and it includes the town of Eagle, Colo., which is located in the southwestern part of the quadrangle, just south of I-70 and the Eagle River, about 37 km west of Vail, Colo. The map area is part of the I-70 urban corridor, which is experiencing rapid and escalating urban growth. Geologic mapping along this corridor is needed for ongoing land-use planning. A variety of rocks and deposits characterize the map area and areas nearby. Sedimentary rocks present in the map area range in age from Pennsylvanian rocks, which were deposited in the ancestral Eagle basin during the formation of the ancestral Rocky Mountains, to Late Cretaceous rocks that were deposited just prior to the formation of the present Rocky Mountains. The Pennsylvanian rocks in the map area include a thick sequence of evaporitic rocks (Eagle Valley Evaporite). These evaporitic rocks are commonly complexly folded throughout the southern part of the quadrangle where they are exposed. In general, in the central and northern parts of the quadrangle, the sedimentary rocks overlying the evaporite dip gently to moderately northward. Consequently, the youngest sedimentary rocks (Late Cretaceous rocks) are exposed dipping gently to the north in the northern part of the quadrangle; landslide complexes are widespread along the northerly dipping, dip slopes in shaly rocks of the Cretaceous sequence in the northeastern part of the map area. During the Early Miocene, basaltic volcanism formed extensive basaltic flows that mantled the previously deformed and eroded sedimentary rocks. Erosional remnants of the basaltic flows are preserved in the southeastern, west-central, and north-central parts of the map area. Some of these basaltic flows are faulted and downdropped in a manner that suggests they were downdropped in areas where large volumes of the underlying evaporitic rocks were removed from the subsurface, beneath the basaltic rocks, by dissolution or flowage of the evaporite in the subsurface. Quaternary and late Tertiary(?) surficial deposits in the map area consist mainly of Quaternary alluvium and colluvium, late and middle Pleistocene terrace gravels of the Eagle River, Miocene(?) gravel remnants of the ancestral Eagle River and its tributaries, and Pleistocene to recent mass movement deposits that include landslides and debris flows. Potential geologic hazards in the map area include landslides, debris flows, rockfalls, local flooding, ground subsidence, and expansive and corrosive soils. Purpose: This map was funded by the National Cooperative Geologic Program as part of the geologic mapping studies conducted along the I-70 urban corridor. This corridor is experiencing rapid urban growth and geologic mapping is needed to aid in land-use planning in order to address, avoid, and mitigate known and potential geologic hazards. Supplemental_Information: Map political location: Eagle County, Colorado Compilation scale: 1:24,000 Geology mapped in 1997. > >GEOSPATIAL DATA FILES INCLUDED IN THIS DATA SET: >eaglepy: polygon coverage containing geologic unit contacts and labels. >eagleln: arc coverage containing fold axes and other line entities. >eaglept: point coverage containing bedding attitude measurements and other point entities. >eaglepit: polygon coverage containing gravel pits. > 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. Production of geologic map products for adjacent quadrangles are in progess and a revised version of this map may eventually be produced. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -106.875 East_Bounding_Coordinate: -106.75 North_Bounding_Coordinate: 39.75 South_Bounding_Coordinate: 39.625 Keywords: Theme: Theme_Keyword_Thesaurus: Glossary of Geology, American Geological Institute Theme_Keyword: geologic map Theme_Keyword: basalt Theme_Keyword: salt Theme_Keyword: evaporite Theme_Keyword: landslide Place: Place_Keyword_Thesaurus: U.S. Board on Geographic Names (BGN) Geographic Names Information System (GNIS) Place_Keyword: USA Place_Keyword: Colorado Place_Keyword: Eagle County Stratum: Stratum_Keyword_Thesaurus: none Stratum_Keyword: Minturn Stratum_Keyword: Maroon Stratum_Keyword: Eagle Valley Stratum_Keyword: State Bridge Stratum_Keyword: Chinle Stratum_Keyword: Entrada Stratum_Keyword: Morrison Stratum_Keyword: Dakota Stratum_Keyword: Benton Stratum_Keyword: Niobrara Access_Constraints: none Use_Constraints: none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David J. Lidke Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: MS 913, Box 25046 DFC City: Denver State_or_Province: CO Postal_Code: 80225-0046 Contact_Voice_Telephone: 303-236-1286 Contact_Electronic_Mail_Address: dlidke@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: Browse_Graphic_File_Description: graphic representation of map layout Browse_Graphic_File_Type: PDF Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data were entered 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. 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 has been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. 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 U.S. Geological Survey 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. The smallest area represented is approximately 20 square meters. 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 base map. Lines were digitized from the base map using a digitizer tablet with resolution of 0.001 inch. Most digitized positions on the map are estimated to have about 20-m horizontal accuracy. Lineage: 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 U.S. Geological Survey Central Publications Group, and revisions made to the geospatial database as needed. Process_Date: 2001 Process_Step: Process_Description: The geospatial database files and metadata were quality checked for completeness and consistency. Process_Date: 2001 Process_Step: Process_Description: Final preparation of the geospatial database for distribution, and preparation of map-on-demand files and metadata. Process_Date: 2002 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: -106.8125 Latitude_of_Projection_Origin: 39.625 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: eagleln >--------------------------------------------------------------- > >USER-DEFINED ITEMS IN EAGLELN.AAT: >------------------------------------ > >ATTRIBUTE NAME: DESCRIPTION >DATABASE ITEM STRUCTURE: 80,80,C,0 >DESCRIPTION: type of line entity >ITEM VALUES FOR 'DESCRIPTION': >(see table below) > >ATTRIBUTE NAME: SYMBOL >DATABASE ITEM STRUCTURE: 3,3,I,0 >DESCRIPTION: line symbol used to draw line entity (geol_sfo.lin and geoscamp1.lin) >ITEM VALUES FOR 'SYMBOL': >(see table below) > >Relationship of items 'DESCRIPTION' and 'SYMBOL': > >DESCRIPTION SYMBOL >--------------------------------------------------- >anticline, certain 60 >anticline, concealed 63 >anticline, inferred 62 >cross-section A-A' 210 >cross-section B-B' 210 >plunging anticline, certain 60 >plunging anticline, concealed 63 >plunging syncline, certain 92 >plunging syncline, concealed 95 >pressure (buckle) ridge in landslide 85 >syncline, certain 92 >syncline, concealed 95 >syncline, inferred 94 > > > >--------------------------------------------------------------- >COVERAGE NAME: eaglept >--------------------------------------------------------------- > >USER-DEFINED ITEMS IN EAGLEPT.PAT: >------------------------------------ > >ATTRIBUTE NAME: DESCRIPTION >DATABASE ITEM STRUCTURE: 80,80,C,0 >DESCRIPTION: type of point entity >ITEM VALUES FOR 'DESCRIPTION': >(see table below) > >ATTRIBUTE NAME: AZIMUTH >DATABASE ITEM STRUCTURE: 3,3,I,0 >DESCRIPTION: compass orientation of point measurement, if applicable >ITEM VALUES FOR 'AZIMUTH': >integer value in the range 0-359 > > >ATTRIBUTE NAME: INCLINATION >DATABASE ITEM STRUCTURE: 5,5,C,0 >DESCRIPTION: inclination from vertical of point measurement, if applicable >ITEM VALUES FOR 'INCLINATION': >values in the range 0-89, or blank where inclination unknown > > >ATTRIBUTE NAME: SYMBOLCODE >DATABASE ITEM STRUCTURE: 3,3,I,0 >DESCRIPTION: markersymbol used to draw point entity (geoscamp1.mrk, geoscamp2.mrk, usgs.mrk, oilgas.mrk) >ITEM VALUES FOR 'SYMBOLCODE': >(see table below) > >Relationship of items 'DESCRIPTION' and 'SYMBOLCODE': > >DESCRIPTION SYMBOLCODE >------------------------------------------------------- >approximate strike and dip of inclined beds 14 >strike and dip of contorted beds 9 >ash deposit 241 >dry hole 101 >horizontal bedding 1 >minor anticline 413 >strike and dip of inclined beds 2 > > > >--------------------------------------------------------------- >COVERAGE NAME: eaglepy >--------------------------------------------------------------- > >USER-DEFINED ITEMS IN EAGLEPY.PAT: >------------------------------------ > >ATTRIBUTE NAME: DESCRIPTION >DATABASE ITEM STRUCTURE: 80,80,C,0 >DESCRIPTION: description of geologic unit >ITEM VALUES FOR 'DESCRIPTION': >(see table below) > >ATTRIBUTE NAME: LABEL >DATABASE ITEM STRUCTURE: 6,6,C,0 >DESCRIPTION: geologic unit label >ITEM VALUES FOR 'LABEL': >(see table below) > >ATTRIBUTE NAME: SYMBOL >DATABASE ITEM STRUCTURE: 4,4,I,0 >DESCRIPTION: shade symbol used to color geologic unit polygon (color524.shd) >ITEM VALUES FOR 'SYMBOL': >(see table below) > >Relationship of items 'DESCRIPTION', 'LABEL', and 'SYMBOL': > >LABEL SYMBOL DESCRIPTION >-------------------------------------------- >(none) 313 water >&e 241 Eagle Valley Formation >&ee 243 Eagle Valley Evaporite >@Ps 372 State Bridge Formation >@c 510 Chinle Formation >Je 365 Entrada Sandstone >Jm 427 Morrison Formation >Kb 379 Benton Shale >Kd 454 Dakota Sandstone >Kn 482 Niobrara Formation >Ku 391 Niobrara Formation and Benton Shale, undivided >P&m 320 main body of Maroon Formation >Pms 316 Schoolhouse Member of Maroon Formation >QTbr 22 basalt rubble >Qa 6 stream-channel and flood-plain deposits along Brush Creek >Qac 25 undivided alluvium and colluvium >Qalc 7 stream-channel and flood-plain deposits along Eagle River >Qc 12 colluvium, undifferentiated >Qcd 12 colluvium of Dakota Sandstone >Qcg 12 gravelly colluvium >Qcv 12 basalt-rich colluvium >Qdo 34 older debris-flow deposits >Qdu 55 undifferentiated debris-flow and landslide deposits of Eby Creek >Qdy 15 younger debris-flow deposits >Qfo 33 older fan alluvium and colluvium >Qfy 32 younger fan alluvium and colluvium >Qls 16 landslide deposits >Qlsb 16 landslide derived from Benton Shale >Qlsn 16 landslide derived from Niobrara Formation >Qlsv 16 landslide debris of volcanic rocks >Qp 451 pediment deposit >Qtm 20 intermediate terrace alluvium >Qto 13 older terrace alluvium >Qtpl 19 lower oldest terrace alluvium >Qtpm 19 middle oldest terrace alluvium >Qtpu 19 upper oldest terrace alluvium >Qty 23 younger terrace alluvium >Tb 130 basaltic flows >Tbv 39 basaltic flows, volcaniclastic rocks, and conglomerate >Tg 51 Tertiary gravel >af 8 artificial fill > >In the LABEL item, the & and @ refer to the Pennsylvanian and Triassic >symbols, respectively. > >USER-DEFINED ITEMS IN EAGLEPY.AAT: >------------------------------------ > >ATTRIBUTE NAME: DESCRIPTION >DATABASE ITEM STRUCTURE: 80,80,C,0 >DESCRIPTION: type of line entity >ITEM VALUES FOR 'DESCRIPTION': >(see table below) > >ATTRIBUTE NAME: SYMBOL >DATABASE ITEM STRUCTURE: 3,3,I,0 >DESCRIPTION: line symbol used to draw line entity (geol_sfo.lin and geoscamp1.lin) >ITEM VALUES FOR 'SYMBOL': >(see table below) > >Relationship of items 'DESCRIPTION' and 'SYMBOL': > >DESCRIPTION SYMBOL >----------------------------------------------------- >contact, certain 1 >contact, approximately located 2 >contact, concealed 4 >high-angle fault, certain 173 >high-angle fault, concealed 176 >high-angle fault, inferred 217 >high-angle fault, certain, with bar and ball 50 >high-angle fault, concealed, with bar and ball 184 >high-angle fault, inferred, with bar and ball 183 >landslide scarp, certain 15 >map boundary 50 >marker bed, certain 50 >marker bed, approximately located 51 >water boundary 0 > >--------------------------------------------------------------- >COVERAGE NAME: eaglepit >--------------------------------------------------------------- > >USER-DEFINED ITEMS IN EAGLEPIT.PAT: >------------------------------------ > >ATTRIBUTE NAME: DESCRIPTION >DATABASE ITEM STRUCTURE: 80,80,C,0 >DESCRIPTION: description of polygon >ITEM VALUES FOR 'DESCRIPTION': gravel pit > >ATTRIBUTE NAME: SYMBOL >DATABASE ITEM STRUCTURE: 4,4,I,0 >DESCRIPTION: shade symbol used to color polygon (color524.shd) >ITEM VALUES FOR 'SYMBOL': 0 > > >USER-DEFINED ITEMS IN EAGLEPY.AAT: >------------------------------------ > >ATTRIBUTE NAME: DESCRIPTION >DATABASE ITEM STRUCTURE: 80,80,C,0 >DESCRIPTION: type of line entity >ITEM VALUES FOR 'DESCRIPTION': gravel pit boundary > >ATTRIBUTE NAME: SYMBOL >DATABASE ITEM STRUCTURE: 3,3,I,0 >DESCRIPTION: line symbol used to draw line entity (geol_sfo.lin and geoscamp1.lin) >ITEM VALUES FOR 'SYMBOL': 1 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: Central Publications Group Address: MS 902, Box 25046, DFC City: Denver State_or_Province: CO Postal_Code: 80225-0046 Contact_Voice_Telephone: 303-236-5486 Contact_Electronic_Mail_Address: webmaster@geology.cr.usgs.gov Resource_Description: MF-2361 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 U.S. Geological Survey 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 Format_Version_Number: ArcInfo version 7.1.2 File_Decompression_Technique: .tar.gz - UNIX gzip-compressed TAR file - use GNU zip and TAR .ZIP - Windows ZIP archive - use Winzip, PKZip, or similar program to extract Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Fees: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S.Geological Survey Contact_Address: Address_Type: mailing address Address: USGS Information Services Address: Box 25286 City: Denver State_or_Province: CO Postal_Code: 80225 Country: United States Contact_Voice_Telephone: 1-888-ASK-USGS Resource_Description: MF-2361 (Map-on-Demand) Distribution_Liability: none Standard_Order_Process: Non-digital_Form: Available as one printed sheet. Order from USGS at the address listed above or see http://rmmcweb.cr.usgs.gov/pub/mod/order.html for more ordering information. Fees: for current prices please see http://rmmcweb.cr.usgs.gov/public/mod/order.html Metadata_Reference_Information: Metadata_Date: 20020222 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David J. Lidke Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: MS 913, Box 25046, DFC City: Denver State_or_Province: CO Postal_Code: 80225-0046 Contact_Voice_Telephone: 303-236-1286 Contact_Electronic_Mail_Address: dlidke@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998