Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho

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Frequently anticipated questions:

What does this data set describe?

Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho
The paper version of the Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho was compiled by Anna Wilson and Betty Skipp in 1994. The geology was compiled on a 1:250,000 scale topographic base map. TechniGraphic System, Inc. of Fort Collins Colorado digitized this map under contract for N.Shock. G.Green edited and prepared the digital version for publication as a GIS database. The digital geologic map database can be queried in many ways to produce a variety of geologic maps.
  1. How might this data set be cited?
    Wilson, A.B., and Skipp, Betty, 1994, Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho: U.S. Geological Survey Miscellaneous Investigations Series Map I-2395, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -114.5
    East_Bounding_Coordinate: -112.75
    North_Bounding_Coordinate: 45.0
    South_Bounding_Coordinate: 43.5
  3. What does it look like? (PDF)
    A PDF representation of the geologic map of the eastern part of the Challis National Forest and vicinity at a scale of 1:250000. <1 megabyte.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2000
    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?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      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?
    The databases in this report were compiled in ARC/INFO, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California).
    U.S.G.S. Miscellaneous Investigations Series Map 2395 files rocks_1.txt and rocks_2.txt
    geologic map unit coverage (Source: I-2395)
    Map unit abbreviation (Source: I-2395)
    QsSurficial deposits (Quaternary)
    QbBasalt (Quaternary)
    QTsSurficial deposits (Quaternary and Tertiary)
    TsSedimentary rocks and tuff (Tertiary)
    TeExtrusive rocks (Tertiary)
    TiIntrusive rocks (Tertiary)
    TjJasperoid (Tertiary)
    TcConglomerate (Tertiary)
    PIPwWood River Formation of the Sun Valley Group (Lower Permian to Middle Pennsylvanian)
    PMcMixed carbonate and siliciclastic rocks (Lower Permian to Upper Mississippian)
    McCopper Basin Formation (Upper and Lower Mississippian)
    MwWhite Knob Limestone (Upper Mississippian)
    McbCarbonate bank units (Upper Mississippian)
    MmMcGowan Creek Formation (Lower Mississippian)
    DmMilligen Formation (Devonian)
    DcCarbonate rocks (Devonian)
    DOsArgillite and siltstone (Devonian to Ordovician)
    DSOcCarbonate rocks (Devonian to Ordovician)
    DOcCarbonate rocks (Lower Devonian to Ordovician)
    OkKinnikinic Quartzite (Middle Ordovician)
    OsSummerhouse Formation (Lower Ordovician)
    OeElla Dolomite (Middle Ordovician)
    OcClayton Mine Quartzite (Ordovician or older)
    OZqQuartzitic rocks (Ordovician to Late Proterozoic)
    YmMetasedimentary rocks (Middle Proterozoic)
    XAgGneissic rocks (Early Proterozoic to Archean(?))
    Full name of map unit (Source: I-2395)
    Geologic map unit boundaries (Source: I-2395)
    Accuracy of map unit boundaries (Source: I-2395)
    certainBoundary between two mapped units that was observed
    inferredBoundary between two mapped unit was inferred
    Differing boundaries (Source: I-2395)
    colorboundEdge of geologic map
    contactGeological boundary between two map units
    neatlineDifferent type of edge of geologic map
    Mapped faults area (Source: I-2395)
    Accuracy of mapped faults (Source: I-2395)
    certainObserved fault
    concealedFault that is concealed and its position inferred
    inferredFault whose position is inferred
    Types of faults found in mapped area (Source: I-2395)
    high-angleHigh-angle normal faults - Dashed where approximately located; dotted where concealed. Bar and ball on downthrown side where sense of movement is known
    includes detachmentDetachment of large rock from rock slides.
    low-angle normalLow-angle normal fault - Hachures on over-rinding block
    strike-slipStrike-slip fault showing relative horizontal movement
    thrustThrust Fault - Sawteeth on over-rinding block
    Indicates difference between fault and rock slide (Source: I-2395)
    faultActual fault
    rock sildeOutlines large sheets of mostly brecciated limestone emplaced by gravity. Includes detachment faults of Beutner (1968).

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • A.B. Wilson
    • Betty Skipp
  2. Who also contributed to the data set?
    Wilson and Skipp compiled the geology onto stable-base material at a scale of 1:250,000. That version was published as USGS publication MAP I-2395. TechniGraphic System, Inc. of Fort Collins Colorado digitized that map for the USGS in 1999 under contract for N.Shock (USGS). G.Green (USGS) edited and prepared for digital release the Arc/Info databases. The files are stored in the following projection; UTM, meters, zone 11, NAD27, Clarke 1866
  3. To whom should users address questions about the data?
    Gregory N. Green
    U.S. Geological Survey
    MS 905, USGS, Denver Federal Center
    Denver, CO

    (303) 236-5390 (voice)

Why was the data set created?

This dataset was developed to provide a geologic map GIS database of Challis National Forest, Idaho for use in spatial analysis by a variety of users.

How was the data set created?

  1. From what previous works were the data drawn?
    Wilson and Skipp (1994) (source 1 of 1)
    Wilson, Anna B., and Skipp, Betty, 1994, Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho: U.S. Geological Survey Miscellaneous Investigations Series Map I-2395, U.S. Geological Survey, Denver, Colorado, USA.

    Type_of_Source_Media: stable-base clear film positives
    Source_Scale_Denominator: 250000
    Wilson and Skipp compiled and published the geology in 1994. Published and unpublished sources for the compilation with the paper version accompanying text. Gregory N. Green was responsible for creating the digital product.
  2. How were the data generated, processed, and modified?
    Date: 2000 (process 1 of 2)
    Clear film positives of the 1:250,000-scale geologic map compilation were electronically scanned to create raster images, converted to vector, polygon, and point GIS layers, and attributed by the contractor Techni Graphics Systems, Inc. of Fort Collins Colorado. At the USGS these files were further attributed, edited, and compared to the original film positives to check for digitizing and attributing errors. Corrections were made as needed.
    Date: 23-Mar-2010 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Gregory N. Green
    MS 905, USGS, Denver Federal Center
    Denver, CO

    (303) 236-5390 (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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the observations, including topology?
    manual check against orginals

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints: none
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    PO Box 25286, Denver Federal Center
    Denver, CO

    1-888-ASK-USGS (1-888-275-8747) (voice)
  2. What's the catalog number I need to order this data set? U.S. Geological Survey Miscellaneous Investigations Series Map I-2395
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:250,000.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho in format ARCE (version ARC/INFO version 7.1.2) Size: 14
      Network links:
    • Cost to order the data: none

Who wrote the metadata?

Last modified: 13-Jun-2016
Last Reviewed: 20-Jul-2000
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:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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