Geologic Map of the Salmon National Forest and Vicinity, East-Central Idaho

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Frequently anticipated questions:

What does this data set describe?

Title:
Geologic Map of the Salmon National Forest and Vicinity, East-Central Idaho
Abstract:
The geology of the Salmon National Forest, Idaho, was compiled from published and unpublished sources and new field mapping by Evans, Lund, Tysdal, and Winkler between 1997 and 2001. The geology was compiled onto 1:100,000-scale topographic base maps for input into a geographic information system (GIS). 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?
    Evans, Karl V., Lund, Karen I., Tysdal, Russell G., Green, Gregory N., and Winkler, Gary R., 2003, Geologic Map of the Salmon National Forest and Vicinity, East-Central Idaho: U.S. Geological Survey Geologic Investigations Series I-2765, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -115.1
    East_Bounding_Coordinate: -112.9
    North_Bounding_Coordinate: 45.8
    South_Bounding_Coordinate: 44.3
  3. What does it look like?
    http://pubs.usgs.gov/imap/i-2765/i-2765_1.pdf (PDF)
    Printable representation of map sheet 1, showing the western 2/3 of the mapped area, 10 megabytes.
    http://pubs.usgs.gov/imap/i-2765/i-2765_2.pdf (PDF)
    Printable representation of map sheet 2, showing the eastern 1/3 of the mapped area, 7 megabytes.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2003
    Currentness_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 Albers Conical Equal Area.
      Projection parameters:
      Standard_Parallel: 44.0
      Standard_Parallel: 48.0
      Longitude_of_Central_Meridian: -114.0
      Latitude_of_Projection_Origin: 41.0
      False_Easting: 0
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 50
      Ordinates (y-coordinates) are specified to the nearest 50
      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?
    Entity_and_Attribute_Overview:
    The polygon coverage of geologic units contains unit symbols and short descriptions. The units are described more fully in the accompanying textual report.
    The dataset includes a geologic coverage with formations, faults and dikes, a decoration coverage with fault, dike, caldera, and fold symbols, a coverage with strike and dip point data, an oil and gas well location point coverage, a breccia zone overlay coverage, and a latitude and longitude grid coverage.
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/imap/i-2765/i-2765_508.pdf

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karl V. Evans
    • Karen I. Lund
    • Russell G. Tysdal
    • Gregory N. Green
    • Gary R. Winkler
  2. Who also contributed to the data set?
    Karl V. Evans (USGS) compiled the geology onto scale-stable base materials At a scale of 1:100,000. Geologic Data Systems,Inc. (GDS), scanned the geologic map and provided attributed Arc/Info .e00 files to the USGS in decimal degree format. Gregory N. Green imported the files, transformed them to UTM zone 11 or zone 12 and Albers Conic Equal Area projections, and checked for errors. The files are stored in Albers Conic Equal Area projection for ease of use across the UTM zone.
  3. To whom should users address questions about the data?
    Karl V. Evans
    U.S. Geological Survey
    geologist
    MS 905, USGS, Denver Federal Center
    Denver, CO
    USA

    (303) 236-5625 (voice)
    kvevans@usgs.gov

Why was the data set created?

This dataset was developed to provide a geologic map GIS database of Salmon 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?
    Western part (source 1 of 2)
    Tysdal, R.G., Lund, K.I., and Evans, K.V., 2003, Geologic map of the western part of the Salmon National Forest:.

    This is part of the following larger work.

    Evans, Karl V., and Green, Gregory N., 2003, Geologic map of the Salmon National Forest and vicinity, east-central Idaho: U.S. Geological Survey Geologic Investigations Series I-2765, U.S. Geological Survey, Denver, Colorado.

    Online Links:

    Type_of_Source_Media: scale-stable base material; clear-film positives
    Source_Scale_Denominator: 100000
    Source_Contribution: Western two thirds (approximate fraction) of the study area
    Eastern part (source 2 of 2)
    Lund, K.I., Evans, K.V., Tysdal, R.G., and Winkler, G.R., 2003, Geologic map of the eastern part of the Salmon National Forest:.

    This is part of the following larger work.

    Evans, Karl V., and Green, Gregory N., 2003, Geologic map of the Salmon National Forest and vicinity, east-central Idaho: U.S. Geological Survey Geologic Investigations Series I-2765, U.S. Geological Survey, Denver, Colorado.

    Online Links:

    Type_of_Source_Media: scale-stable base material; clear-film positives
    Source_Scale_Denominator: 100000
    Source_Contribution: Eastern third (approximate fraction) of the study area
  2. How were the data generated, processed, and modified?
    Date: 1997 (process 1 of 3)
    Karl V. Evans compiled the geology of the Salmon National Forest, Idaho, from 1997 to 1998. Karl Evans, Karen Lund, Russ Tysdal, and Gary Winkler undertook field mapping to resolve problems in geologically complex areas. Older sources for the compilation are listed in the bibliography of the accompanying text, and an index map showing the extent of the older source maps is shown on sheet 2. Gregory N. Green was responsible for creating the digital database. Data sources used in this process:
    • Western part
    • Eastern part
    Date: 2002 (process 2 of 3)
    Clear-film positives of the 1:100,000-scale geologic map compilation were electronically scanned to create raster images, converted to vector, polygon, and point GIS layers, and attributed by a contractor (Geologic Data Systems, Inc., Denver, CO). These digital files were then augmented with an interim geologic map data model. The initial products were remitted to the USGS in Arc/Info EXPORT format as latitude and longitude. At the USGS these files were projected and further attributed, edited, and compared to the original film positives to check for digitizing and attributing errors. Corrections were made as needed.
    Date: 21-Feb-2003 (process 3 of 3)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Gregory N. Green
    Box 25046, MS 905, USGS, Denver Federal Center
    Denver, CO
    USA

    (303) 236-5390 (voice)
    ggreen@usgs.gov
  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?
    The geologic map comprises recent published and unpublished mapping, primarily by members of the USGS; older maps were used only where recent coverage was lacking. Since the mid-1980 s, several research projects of the USGS yielded new maps for large areas of the Salmon National Forest. Not all questions of map relations could be adequately resolved with existing data, so careful users of the map will note a few areas of apparent geologic and geometric problems. This is particularly true for the northwestern part of the Beaverhead Mountains and the northeastern part of the Clearwater Mountains. Almost no field work was undertaken in these areas and satisfactory reconciliation of previous, differing map interpretations was not readily accomplished. Some interpretation in the westernmost part of the western map sheet is speculative.

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. 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
    P.O. Box 25046, Denver Federal Center, MS-902
    Denver, CO
    USA

    303-236-5486 (voice)
  2. What's the catalog number I need to order this data set? USGS Geologic Investigations Map I-2765
  3. What legal disclaimers am I supposed to read?
    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 database 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 GIS database is not meant to be used or displayed at any scale other than 1:100,000.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Jun-2016
Last Reviewed: 08-Jul-2003
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:
This page is <https://geo-nsdi.er.usgs.gov/metadata/map-i/2765/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:04:56 2018