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Geologic map of the Vail East quadrangle, Eagle County, Colorado

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Frequently anticipated questions:

What does this data set describe?

Geologic map of the Vail East quadrangle, Eagle County, Colorado
New 1:24,000-scale geologic mapping along the Interstate-70 urban corridor in western Colorado, in support of the State/ USGS Cooperative Geologic Mapping Project, is contributing to a more complete understanding of the stratigraphy, structure, tectonic evolution, and hazard potential of this rapidly developing region. The 1:24,000-scale Vail East quadrangle straddles the Gore fault system, the western structural boundary of the Gore Range. The Gore fault system is a contractional structure that has been recurrently active since at least the early Paleozoic and marks the approximate eastern boundary of the Central Colorado trough, a thick late Paleozoic depocenter into which thousands of meters of clastic sediment were deposited from several uplifts, including the ancestral Front Range. The Gore fault was active during both the late Paleozoic and Upper Cretaceous-lower Tertiary (Laramide) deformations. In addition, numerous north-northwest faults that cut the crystalline rocks of the Gore Range were active during at least 5 periods, the last of which was related to Neogene uplift of the Gore Range and formation of the northern Rio Grande rift.
Early Proterozoic crystalline rocks underlie the high Gore Range, north and east of the Gore fault system. These rocks consist predominantly of migmatitic biotite gneiss intruded by mostly granitic rocks of the 1.667-1.750 Ma Cross Creek batholith, part of the 1,667-1,750 Ma Routt Plutonic Suite ( Tweto, 1987).
Southwest of the Gore fault, a mostly gently south-dipping sequence of Pennsylvanian Mimturn Formation, as thick as 1,900 m, and the Permian and Pennsylvanian Maroon Formation (only the basal several hundred meters are exposed in the quadrangle)were shed from the ancestral Front Range and overlie a thin sequence of Devonian and Cambrian rocks. The Minturn Formation is a sequence of interlayered pink, maroon, and gray conglomerate, sandstone, shale, and marine limestone. The Maroon Formation is mostly reddish conglomerate and sandstone.
Glacial till of both the middle Pleistocene Bull Lake and late Pleistocene Pinedale glaciations are well exposed along parts of the Gore Creek valley and its tributaries, although human development has profoundly altered the outcrop patterns along the Gore Creek valley bottom. Landslides, some of which are currently active, are also mapped.
  1. How might this data set be cited?
    Kellogg, Karl S., Bryant, Bruce, and Redsteer, Margaret H., 2003, Geologic map of the Vail East quadrangle, Eagle County, Colorado: U.S. Geological Survey Miscellaneous Field Studies Map MF-2375, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -106.375
    East_Bounding_Coordinate: -106.25
    North_Bounding_Coordinate: 39.75
    South_Bounding_Coordinate: 39.625
  3. What does it look like? (GIF)
    Reduced-size image of the map sheet, 288x384 pixels, 34k bytes. (PDF)
    Printable representation of map layout, 2.6 megabytes.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2003Currentness_Reference: publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set.
    2. What coordinate system is used to represent geographic features?
      The map projection used is Lambert Conformal Conic.
      Projection parameters:
      Standard_Parallel: 39.75
      Standard_Parallel: 38.45
      Longitude_of_Central_Meridian: -105.5
      Latitude_of_Projection_Origin: 0
      False_Easting: 0
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.397349953651
      Ordinates (y-coordinates) are specified to the nearest 1.397349953651
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    COVERAGE NAME: vaileastgeol
     1  AREA                   4    12     F      3                        -
     5  PERIMETER              4    12     F      3                        -
     9  VAILEASTGEOL#          4     5     B      -                        -
    13  VAILEASTGEOL-ID        4     5     B      -                        -
    17  SYMBOL                 4     4     I      -    S                   -
    21  LABEL                  6     6     C      -    L                   -
    27  UNIT                   5     5     C      -                        -
    32  DESCRIPTION          100   100     C      -    D                   -
    LABEL:       Geologic unit label with symbols for unique geologic fonts.
    UNIT:        Geologic unit label with letters for unique geologic fonts.
    SYMBOL:    Numbers given to map units representing values of color used from shadeset "color524.shd".
    DESCRIPTION:  Brief geologic explanations of map units.
    ----    -------------------------------------------------------------------
    Cp	Peerless Formation (Upper Cambrian)
    Cs	Sawatch Quartzite (Upper Cambrian)
    Dp	Parting Formation (Upper Devonian)
    PPm	Maroon Formation (Permian and Pennsylvanian)
    Pm	Minturn Formation, undifferentiated (Middle Pennsylvanian)
    Pmj	Jacque Mountain Limestone Member of Minturn Formation
    Pml	Lower member of Minturn Formation
    Pmls	Limestone bed of Lower member
    Pmm	Middle member of Minturn Formation
    Pmr	Robinson Limestone Member of Minturn Formation
    Pmrl	Limestone bed of Robinson Member
    Pmu	Upper member of Minturn Formation
    Pmwq	White Quail Limestone Member of Minturn Formation
    Qa	Alluvium (Holocene)
    Qac	Alluvium and colluvium, undivided (Holocene and upper Pleistocene)
    Qbf	Boulder field (upper Pleistocene)
    Qc	Colluvium (Holocene and upper Pleistocene)
    Qd	Diamicton (middle to lower Pleistocene)
    Qdf	Debris-flow deposits (Holocene and upper Pleistocene)
    Qf	Fan deposits (Holocene and upper Pleistocene)
    Qfm	Felsenmeer (Holocene and Pleistocene)
    Qls	Landslide deposits (Holocene and upper Pleistocene)
    Qlsy	Recent landslide deposits (Holocene)
    Qr	Rock-glacier deposits (Holocene and upper Pleistocene)
    Qt	Talus (Holocene and upper Pleistocene)
    Qtb	Till of Bull Lake glaciation (middle Pleistocene)
    Qtb?	Till of Bull Lake glaciation (middle Pleistocene), queried
    Qtp	Till of Pinedale glaciation (upper Pleistocene)
    Qtp?	Till of Pinedale glaciation (upper Pleistocene), queried
    Qw	Wetland deposits (Holocene and upper Pleistocene)
    Xap	Aplitic granite (Early Proterozoic)
    Xbg	Biotite gneiss (Early Proterozoic)
    Xdi	Diorite (Early Proterozoic)
    Xg	Cross Creek Granite (Early Proterozoic)
    Xgb	Gabbro (Early Proterozoic)
    Xm	Migmatitic biotite gneiss (Early Proterozoic)
    af	Artificial fill (Holocene)
    s	Snowfield (Holocene)
    w	Body of water
     1  FNODE#                 4     5     B      -                        -
     5  TNODE#                 4     5     B      -                        -
     9  LPOLY#                 4     5     B      -                        -
    13  RPOLY#                 4     5     B      -                        -
    17  LENGTH                 4    12     F      3                        -
    21  VAILEASTGEOL#          4     5     B      -                        -
    25  VAILEASTGEOL-ID        4     5     B      -                        -
    29  DESCRIPTION           80    80     C      -    D                   -
    DESCRIPTION:   Description of line features, using digital cartographic standards
    clastic dike-certain
    contact-approximately located
    fault-approximately located
    map boundary
    normal fault-approximately located
    normal fault-certain
    reverse fault-approximately located
    reverse fault-certain
    shear zone
    strike-slip fault, left-lateral offset-approximately located
    strike-slip fault, left-lateral offset-certain
    thrust fault-certain
    ------------------------------ COVERAGE NAME: vaileastline ------------------------------
     1  FNODE#                 4     5     B      -                        -
     5  TNODE#                 4     5     B      -                        -
     9  LPOLY#                 4     5     B      -                        -
    13  RPOLY#                 4     5     B      -                        -
    17  LENGTH                 4    12     F      3                        -
    21  VAILEASTLINE#          4     5     B      -                        -
    25  VAILEASTLINE-ID        4     5     B      -                        -
    29  DESCRIPTION           80    80     C      -    D                   -
    DESCRIPTION:  Description of line features, using digital cartographic standards
    cross-section line
    dike or sill-certain
    horizontal anticline-concealed
    horizontal syncline-certain
    horizontal syncline-concealed
    limestone bed line
    reverse fault-concealed
    thrust fault-concealed
    COVERAGE NAME: vaileastpoint
     1  AREA                   4    12     F      3                        -
     5  PERIMETER              4    12     F      3                        -
     9  VAILEASTPOINT#         4     5     B      -                        -
    13  VAILEASTPOINT-ID       4     5     B      -                        -
    17  ROTATION               7     7     I      -                        -
    24  INCLINATION            5     5     I      -                        -
    29  DESCRIPTION           80    80     C      -    D                   -
    ROTATION:  Compass direction of bedding trend, in degrees.
    INCLINATION:  Angle of bedding dip, in degrees from horizontal.
    DESCRIPTION   Brief geologic explanation of point type, using digital cartographic standards
    fault dip symbol
    fold plunge arrow
    horizontal bedding
    inclined bedding - showing approximate strike and dip
    inclined bedding - showing strike and dip
    inclined foliation - showing strike and dip
    inclined joints - showing strike and dip
    left lateral symbol
    lineation arrows
    minor inclined fault - showing strike and dip
    minor vertical or near-vertical fault - showing strike
    overturned bedding - showing strike and dip
    vertical bedding
    vertical foliation  - showing strike
    ITEM VALUES FOR 'ROTATION: range of values: 0 - 359
    ITEM VALUES FOR 'INCLINATION': range of values: 0 - 90

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    Assisted in the field by G. Murray
  3. To whom should users address questions about the data?
    Karl Kellogg
    U.S. Geological Survey
    Mail Stop 980
    Box 25046, Denver Federal Center
    Denver, CO

    303-236-1305 (voice)
    303-236-0214 (FAX)

Why was the data set created?

To update and reinterpret earlier geologic mapping of the area, and to achieve a uniform regional geologic database.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2000 (process 1 of 8)
    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).
    Date: 2000 (process 2 of 8)
    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.
    Date: 2001 (process 3 of 8)
    Text map unit descriptors were added to the .AAT and .PAT database files for each coverage.
    Date: 2001 (process 4 of 8)
    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.
    Date: 2001 (process 5 of 8)
    The geospatial database files and metadata were quality checked for completeness and consistency.
    Date: 2001 (process 6 of 8)
    The database files, metadata, and check plots were edited by the USGS Central Publications Group, and revisions made to the geospatial database as needed.
    Date: 2002 (process 7 of 8)
    Final preparation of the geospatial database for distribution, and preparation of map-on-demand files and metadata.
    Date: 10-Jun-2009 (process 8 of 8)
    Creation of original metadata record Person who carried out this activity:
    Paco VanSistine
    U.S. Geological Survey
    U.S. Geological Survey
    Lakewood, CO

    303-236-5452 (voice)
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Data was entered and checked by the geologist who made the 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 was been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.
  2. How accurate are the geographic locations?
    Lines were primarily mapped by ground investigation and photointerpretation of 1:24,000-scale color aerial photographs. These lines were digitized from the topographic field sheets and from annotated aerial photographs. Most digitized positions on the map are estimated to have about 20 m horizontal accuracy. Additional point observations were added using positions determined by a Rockwell PLGR-96 GPS unit with horizontal accuracy of about 10 meters. There is no elevation data in the database.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    No features were eliminated or generalized, at the scale of map compilation (1:24,000)
  5. How consistent are the relationships among the observations, including topology?
    Map elements were visually checked by the author for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ARC/INFO) 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. The map was reviewed by two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey Central Publications Group
    MS 902, Box 25046 DFC
    Lakewood, CO

    303-236-5486 (voice)
  2. What's the catalog number I need to order this data set? USGS Miscellaneous Field Studies Map MF-2375
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 13-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse,
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA

703-648-6533 (voice)
703-648-6252 (FAX)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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