United States Geological Survey 19990930 Downloadable GIS Data U. S. Geological Survey Professional Paper 1625-A Reston,VA USGS Central Region Energy Resources Team Fort Union Coal Asssessment Team 1999 U.S. Geological Survey Professional Paper 1625-A Denver, CO U.S. Geological Survey https://greenwood.cr.usgs.gov/energy/coal/PP1625A/ https://doi.org/10.5066/P9XQXO9M These ArcView shapefiles contain representations of the thickness of overburden above the Ferris coal zones in the Ferris coalfield, Hanna Basin, Wyoming. These datasets was created specifically for the National Coal Resource Assessment in the Northern Rocky Mountains and Great Plains Region. The Nation's coal resources are being assessed by the USGS. This assessment identifies and characterizes the coal beds and coal zones that will provide the bulk of the Nation's coal-derived energy during the next few decades. This assessment is different from previous USGS assessments because digital files and databases are being collected and stored in standardized formats, and being analyzed using a Geographic Information System (GIS). 1998 publication date Complete None planned -106.8595 -106.6166 42.0461 41.8166 None Overburden Coal Ferris 23 coal zone Ferris 25 coal zone Ferris 31 coal zone Ferris 50 coal zone Ferris 65 coal zone Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Overburden thickness Minimum overburden Overburden isopach map Ferris Formation National Coal Resource Assessment ArcIMS Metadata Server Theme Codes geoscientificInformation economy environment EnergyResourceActivities coal nca2000 nrockiescoal hannabasincoal None Northern Rocky Mountains and Great Plains Region Wyoming Carbon County Ferris 23 study limit Ferris 25 study limit Ferris 31 study limit Ferris 50 study limit Ferris 65 study limit Ferris coalfield Hanna Basin USGS Metadata Identifier USGS:60c91242d34e86b9389de838 None None U.S. Geological Survey - CERSC Data Management Services Project mailing and physical

Denver Federal Center, Building 25, Mail Stop 939

Denver CO 80225 USA 1-888-275-8747 datamgt@usgs.gov https://www.sciencebase.gov/catalog/file/get/60c91242d34e86b9389de838?f=__disk__a1%2F60%2F08%2Fa16008c8bc1cbcea273229586bcc6dd31828de8e Thumbnail view of overburden above the Ferris 23 coal zone ArcView version 3.0 ARC/INFO 7.1.2 SUNOS, 5.6 SUN4U UNIX Polygon features present See process steps Limited to software coordinates precession to geographic coordinates USGS Energy Resources Team Unpublished material Unknown US Geological Survey MS 956 Reston, VA 20192 (attn. M.D. Carter) online unknown publication date NCRDS This source provided stratigraphic and point location data that were used to create grids representing the elevation at the tops of the coals in the Ferris coal zones. USGS EROS Data Center Unpublished material Unknown http//edcwww.cr.usgs.gov 250000 online 19951000 Publication Date DEM This source contributed data that was used to generate a grid in ARC/INFO that represented the topographic elevation (surface elevation) in the area of the Ferris coal field. Stratigraphic data were compiled in a relational database. These data were correlated and the coal and rock above, within, and below the Ferris coal zones were labeled. Stratigraphic data for the coal and rock units within the Ferrris coal zones were downloaded from the database. These data were loaded into a EarthVision (EV) software program. The elevation at the top of each zone was then gridded in EV using the normal minimum tension grid option, four multiple data points (number of closest control points used for calculating a grid value), and a 500 x 500-meter grid spacing. The ARC/INFO DEM coverage (with 500 x 500-meter data spacing) was imported into EV, defined as a grid file, and clipped to the same lateral extent as the EV grid of the top of each coal zone. Using the EV formula processor, the top of each coal zone grid was subtracted from the surface elevation (DEM) grid to create a (minimum) overburden grid. Isopach maps were then generated from these grids, with a constant contour interval of 100 ft, and saved to files in ASCII format. The ASCII files were modified using a custom program called ismarc. The modified files were imported into ARC/INFO and generated as polygon coverages using an Arc Macro Language (AML) program. The AML clipped the coverages to the study extent and assigned the overburden thickness polygons with values that are the average of the values of the bounding isopach lines (for example, a polygon defined by isopach lines of 100 and 200 ft was assigned an overburden thickness attribute of 150 ft). A new item was then added to the polygon attribute table and populated with text labels corresponding more closely to overburden categories that we were to use for coal resource tables and graphic display (0-100 ft, 100-200 ft, 200-300 ft, 300-400 ft, 400-500 ft, 500-1,000 ft, 1,000-2,000 ft, 2,000-3,000 ft, 3,000-4,000 ft, and >4,000 ft). The polygon coverages were then dissolved based on the text labels. The final coverages were projected to geographic and made into shapefiles in ArcView. 1997 Margaret Ellis USGS Energy Resources Team Geologist mailing address

Box 25046 MS 939 Denver Federal Center

Denver CO 80225-0046 USA 303.236.7775 mellis@usgs.gov Monday through Friday, 8:00 AM- 3:00 PM Vector GT-polygon composed of chains .0001 .0001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.0 298.257222 fer*ovbg.dbf Shapefile Attribute Table None Area Area of polygon Software computed Numeric field Perimeter Perimeter of polygon Software computed Numeric field Overburden Overburden in ft User Defined Character field U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Downloadable Data Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Shapefile https://doi.org/10.5066/P9XQXO9M 20210615 200712 U.S. Geological Survey - CERSC Data Management Services Project mailing and physical

Denver Federal Center, Building 25, Mail Stop 939

Denver CO 80225 USA 1-888-275-8747 datamgt@usgs.gov FGDC CSDGM FGDC-STD-001-1998