Geologic map datasets of the Custer and Gallatin National Forests of South-central Montana, in ARC/INFO format: Northern portion

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Frequently anticipated questions:


What does this data set describe?

Title:
Geologic map datasets of the Custer and Gallatin National Forests of South-central Montana, in ARC/INFO format: Northern portion
Abstract:
The geology of western and northern Gallatin National Forest was mapped in two parts as part of an evaluation of its mineral resource potential by the USGS. Previously, the western part was released as Map A and the northern part as Map B of USGS Geologic Investigations Series Map I-2584. These maps were compiled, digitized, and produced using the USGS software program GSMAP. All the original source maps were simplified on mylar overlays, digitized at their original map scales and projections, and then merged into the final maps. After editing, the digital maps were filtered to remove all points not necessary for improving resolution at a scale of 1:126,720 (2 mi per in., the scale used by the USDA Forest Service). For purposes of resource assessment, many rock units have been combined on these maps. For details, the user should consult the original source maps.
  1. How might this data set be cited?
    Green, Gregory N., Bradley S. Van Gosen, Wilson, Anna B., and Silkwood, Jeffery T., 1999, Geologic map datasets of the Custer and Gallatin National Forests of South-central Montana, in ARC/INFO format: Northern portion: U.S. Geological Survey Open-File Report 99-450, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -111.15
    East_Bounding_Coordinate: -110.15
    North_Bounding_Coordinate: 46.3
    South_Bounding_Coordinate: 45.66
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1999
    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?
      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?
    NORTHERN.PAT
    Geologic map units (Source: OFR-99-0450)
    LABEL
    Symbol of map units (Source: OFR-99-0450)
    ValueDefinition
    QsSurficial deposits, undivided (Quaternary)
    TflFort Logan Formation (lower Miocene)
    TiIntrusive rocks, undivided (Eocene)
    TKfFort Union Formation (Paleocene and Upper Cretaceous)
    KlvLivingston Group (Upper Cretaceous)
    KeEagle Sandstone (Upper Cretaceous)
    KuUpper Cretaceous sedimentary rocks, undivided
    KulUpper and Lower Cretaceous sedimentary rocks, undivided--In descending order, includes Mowry Shale (Upper Cretaceous) and Thermopolis Shale and Kootenai Formation (Lower Cretaceous)
    JuJurassic sedimentary rocks, undivided--Includes Morrison Formation (Upper Jurassic) and underlying Ellis Group (Upper and Middle Jurassic).
    PMuPermian, Pennsylvanian, and Mississippian sedimentary rocks, undivided--In descending order, includes Phosphoria (Permian), Quadrant (Pennsylvanian), and Amsden (Lower Pennsylvanian and Upper Mississippian) Formations.
    MmMadison Group (Mississippian)
    MDtThree Forks Formation (Lower Mississippian and Upper Devonian) and Jefferson Formation (Upper Devonian), undivided
    CuCambrian sedimentary rocks, undivided--In descending order, includes Snowy Range Formation (and laterally equivalent Red Lion Formation) and Pilgrim Limestone (Upper Cambrian); and Park Shale, Meagher Limestone, Wolsey Shale, and Flathead Sandstone (Middle Cambrian).
    YmMiddle Proterozoic metasedimentary rocks, undifferentiated--Includes the Spokane and underlying LaHood (formerly North Boulder Group) Formations of the Belt Supergroup.
    AmMetamorphic rocks (Archean)
    TaAlkalic intrusive rocks (Eocene)
    TiIntrusive rocks, undivided (Eocene)
    TqmQuartz monzodiorite phase
    TdgDiorite and gabbro phase
    TclPorphyry of Campfire Lake (Eocene)
    TKfFort Union Formation (Paleocene and Upper Cretaceous)
    KlvLivingston Group (Upper Cretaceous)
    P1
    numerical representaion of map unit (Source: OFR-99-0450)
    Range of values
    Minimum:1
    Maximum:36
    CALCOMP1
    numerical representaion of map unit (Source: OFR-99-0450)
    Range of values
    Minimum:14
    Maximum:800
    NORTHERN.AAT
    Linear features on map including contacts, faults, dikes, and borders (Source: OFR_99-0450)
    LABEL
    Name of linear features (Source: OFR-99-0450)
    ValueDefinition
    TidikeTertiary intrusive dike
    borderborder around mapped area
    contactgeologic contact
    dashed faultapproximately located fault
    dashed thrust faultapproximately located thrust fault
    decollomentPaleocene plane of sliding
    dotted faultconcealed fault
    dotted thrust faultconcealed thrust fault
    faultfault, certain
    thrust faultthrust fault, certain
    P1
    numerical representaion of linear feature (Source: OFR-99-0450)
    Range of values
    Minimum:1
    Maximum:14
    CARTO
    numerical representaion of linear feature (Source: OFR-99-0450)
    Range of values
    Minimum:101
    Maximum:201
    NORTHERN.POINT
    map units at specific points (Source: OFR-99-0450)
    LABEL, CALCOMP1, and P1
    map unit at specific points (same domains as the polygon coverage NORTHERN.PAT) (Source: OFR-99-0450)
    Entity_and_Attribute_Overview:
    Data files:
    FNT003.E00: ARC/INFO interchange file that can be used to create the fonts labeling the map units on the geologic map of USGS Geologic Investigations Series Map I-2584, sheet 2
    GEOL.KEY: Text file providing a description of the map units
    LOAD.AML: ARCPLOT command that recreates the database structure of this directory
    MAPBAR.AML: ARCPLOT command that creates the map-scale bar
    NORTHERN.AML: ARCPLOT command that creates the geologic map of USGS Geologic Investigations Series Map I-2584, sheet 2
    NORTHERN.BOX: Text file for the map legend in the description of map units shown on USGS Geologic Investigations Series Map I-2584, sheet 2
    NORTHERN.E00: ARC/INFO interchange file that can be used to create the database for sheet 2 of USGS Geologic Investigations Series Map I-2584
    NORTHERN.LIN: Text file for the explanation of map symbols shown on USGS Geologic Investigations Series Map I-2584, sheet 2
    NORTHERN.MET: Metadata file
    NORTHERN.PDF: "Portable Document Format" file that can be viewed with the free software Adobe Acrobat Reader
    PROJECT.TXT: Text file describing the projection applied to this database
    NORTHERN.RTL: A Hewlett Packard graphics plot file ("Raster Transfer Language") format
    N_DECO.E00: ARC/INFO interchange file that can be used to create the decorations on the line work shown on the geologic map of USGS Geologic Investigations Series Map I-2584, sheet 2
    N_TICK.E00: ARC/INFO interchange file that can be used to create the latitude-longitude tic marks shown on the geologic map of USGS Geologic Investigations Series Map I-2584, sheet 2
    SDTS: NORTHERN.EOO in SDTS (Spatial Data Transfer Standard)
    Entity_and_Attribute_Detail_Citation:
    More information can be found in the file readme.txt that can be downloaded with the digital database.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Gregory N. Green
    • Bradley S. Van Gosen
    • Anna B. Wilson
    • Jeffery T. Silkwood
  2. Who also contributed to the data set?
    Gregory N. Green, Anna B. Wilson, and Bradley S. Van Gosen of the U.S. Geological Survey and Jeffrey T. Silkwood of the USDA Forest Service
  3. To whom should users address questions about the data?
    Anna B. Wilson
    U.S. Geological Survey
    geologist
    USGS, Box 25046, MS 905, Denver Federal Center
    Lakewood, CO
    USA

    (303) 236-5593 (voice)
    awilson@usgs.gov

Why was the data set created?

This ARC/INFO dataset was developed to provide a geologic map GIS database of the northern parts (Map B) of the Gallatin National Forest 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?
    Geology of Gallatin National Forest, Wilson and Elliott, 1997 (source 1 of 1)
    Wilson, A.B., and Elliott, J.E., 1997, Geologic maps of western and northern parts of Gallatin National Forest, south-central Montana: U.S. Geological Survey Geologic Investigations Series I-2584, U.S. Geological Survey, Denver, Colorado.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 126720
    Source_Contribution: New and compiled geologic mapping
  2. How were the data generated, processed, and modified?
    Date: 1999 (process 1 of 2)
    The original GSMAP/GSMCAD files used to create Map B of USGS Geologic Investigations Series Map I-2584 were exported through GSMCAD to DXF format. G.N. Green converted the files to ARC/INFO format, reattributed the digital linework and polygons in ARC/INFO, checked the line and polygon attributes against the original and corrected them to match the published paper map. Shadeset and lineset attributes were added in ARC. This ARC database was further edited by G.N. Green to correct minor deviations from the published map. The digital database was quality checked against original materials by Anna Wilson, Bradley Van Gosen, and Melissa Crane.
    Date: 29-Apr-1999 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Anna B. Wilson
    USGS, Box 25046, MS 905, Denver Federal Center
    Lakewood, CO
    USA

    (303) 236-5593 (voice)
    awilson@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?
    finished
  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:
This database is not meant to be used or displayed at any scale other than 1:126,720.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Database Administrator
    USGS, Box 25046, MS 905, Denver Federal Center
    Lakewood, CO
    USA

    (303) 236-5593 (voice)
    awilson@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Open-File Report 99-450
  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 1:126,720.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 14-Jun-2016
Last Reviewed: 21-Jul-2000
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:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/99-450/northern.faq.html>
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