Digital geologic map of the Coeur d'Alene district, Idaho and Montana

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Frequently anticipated questions:

What does this data set describe?

Digital geologic map of the Coeur d'Alene district, Idaho and Montana
Geologic data from a generalized geologic map of the Coeur d'Alene mining district by Gott and Cathrall (1980) was entered into a geographic information system (GIS) as part of a larger effort to create a regional digital geology for the Pacific Northwest. The map area is located in northern Idaho and extends across the state border into western Montana.
  1. How might this data set be cited?
    Derkey, Pamela D., Johnson, Bruce R., and Carver, Michael, 1996, Digital geologic map of the Coeur d'Alene district, Idaho and Montana: U.S. Geological Survey Open-File Report 96-299.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -116.30
    East_Bounding_Coordinate: -115.50
    North_Bounding_Coordinate: 47.58
    South_Bounding_Coordinate: 47.33
  3. What does it look like? (JPEG)
    Reduced-size image of the map, 580x283 pixels, 65k bytes
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1996
    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 Polyconic.
      Projection parameters:
      Longitude_of_Central_Meridian: -116.0
      Latitude_of_Projection_Origin: 47.5
      False_Easting: 0
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Planar coordinates are specified in meters
  7. How does the data set describe geographic features?
    Geologic map (Source: OFR-96-299)
    Numeric code used to identify the geologic unit which is described in teh CDA.RU look-up table. (Source: OFR-96-299)
    Range of values
    Linear features on geologic map (Source: OFR-96-299)
    Numeric code used to identify the type of linear feature. Linecodes <100 are used for contacts and boundaries which are described in the CDA.CON look-up table. Linecodes >100 and <600 represent structural features which are described in the CDA.STR look-up table. (Source: OFR-96-299)
    Range of values
    Name given to structral feature. (Source: OFR-96-299)
    Geologic map units at specific locations (same attributes as polygon coverage of the same name) (Source: OFR-96-299)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Pamela D. Derkey
    • Bruce R. Johnson
    • Michael Carver
  2. Who also contributed to the data set?
    We gratefully acknowledge Arthur A. Bookstrom for his review of this report.
  3. To whom should users address questions about the data?
    Derkey, Pamela D
    W 904 Riverside Avenue
    Spokane, WA

    509-368-3114 (voice)

Why was the data set created?

To provide to the public a digital geologic map database of the Coeur d'Alene mining district.

How was the data set created?

  1. From what previous works were the data drawn?
    Gott and Cathrall (1980) (source 1 of 3)
    Gott, G.B., and Cathrall, J.B., 1980, Geochemical-exploration studies in the Coeur d'Alene district, Idaho and Montana: U.S. Geological Survey Professional Paper 1116.

    Other_Citation_Details: 63 pages and 7 plates
    Type_of_Source_Media: paper
    Source_Contribution: Primary source of geologic data
    Hobbs and others (1965) (source 2 of 3)
    Hobbs, S.W., Griggs, A.B., Wallace, R.E., and Campbell, A.B., 1965, Geology of the Coeur d'Alene district, Shoshone County, Idaho: U.S. Geological Survey Professional Paper 478.

    Other_Citation_Details: 139 pages and 10 plates
    Type_of_Source_Media: paper
    Source_Contribution: Used to attribute the faults.
    Wallace and Hosterman (1956) (source 3 of 3)
    Wallace, R.E., and Hosterman, J.W., 1956, Reconnaisance geology of western Mineral County, Montana: U.S. Geological Survey Bulletin 1027-M.

    Other_Citation_Details: p. 575-612 and 4 plates
    Type_of_Source_Media: paper
    Source_Contribution: Used to attribute the faults.
  2. How were the data generated, processed, and modified?
    Date: 1980 (process 1 of 2)
    The 1:62,500-scale paper geologic map (Gott and Cathrall, 1980, pl. 1) was digitized into PC ARC/INFO using four latitude and longitude pairs for registration points. All four registration points were visually transferred from the corresponding 1:62,500-scale topographic quadrangle maps to the geologic map, because the labeled latitude and longitude locations on the published geologic map did not register well with those on the topographic quadrangle maps. All faults with known offset were digitized as right-reading arcs and assigned right-reading decorated line patterns. The resulting digital map was attributed, converted to ARC/INFO, and then plotted to check for digitizing and attributing errors and to verify the fit with real-world coordinates (mathematically generated points of latitude and longitude).
    Date: 18-May-2009 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Jennifer Lenz
    US Geological Survey
    12201 Surise Valley Drive, Mail Stop 918
    Reston, VA

    703-648-6974 (voice)
    703-648-6560 (FAX)
  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?
    The overall accuracy of the digital map is probably no better than +/- 100m.
  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?
    Plate 1 from Gott and Cathrall (1980) was the primary source of geologic data. Maps by Hobbs and others (1965) and Wallace and Hosternman (1956) were used to attribute the faults.

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
    Box 25286, Denver Federal Center
    Denver, Colorado

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
  2. What's the catalog number I need to order this data set? US Geological Survey Open-File Report 96-299
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with US Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.
  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 05-Feb-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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