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/P9KONIEZ This shapefile contains a representation of the total net coal thickness in the Wyodak-Anderson coal zone. This theme 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 -107.1936 -105.1358 45.4658 42.8777 None Net coal thickness Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Coal Wyodak-Anderson coal zone USGS National Coal Resource Assessment Total net coal thickness Net coal isopach map ArcIMS Metadata Server Theme Codes geoscientificInformation economy environment EnergyResourceActivities coal nca2000 nrockiescoal powderbasincoal None Wyodak-Anderson coal zone Wyoming Northern Rocky Mountain and Great Plains Region Big Horn County Powder River County Rosebud County Campbell County Sheridan County Johnson County Converse County Montana Powder River Basin USGS Metadata Identifier USGS:60ad2f1dd34e4043c850ed4c 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/60ad2f1dd34e4043c850ed4c?f=__disk__94%2F65%2F26%2F946526df809976123472520c36ee6d92a6520137 Thumbnail view of net coal thickness in the Wyodak-Anderson coal zone in the Powder River Basin ArcView version 3.0 ARC/INFO 7.1.2 SUNOS, 5.6 SUN4U UNIX Coal thickness was checked at random point locations in the stratigraphic dataset to determine if coal thickness was accurate. Polygon features present Coal thickness is limited to the Wyodak-Anderson Coal Zone limited to software coordinate precision for geographic coordinates USGS Energy Resources Team Unpublished material Unknown map US Geological Survey Energy Resources Team MS 956 Reston, VA 20192 (attn. M.D. Carter) online 1998 publication date NCRDS This source provided stratigraphic data that was used to calculate net coal thickness in the Wyodak-Anderson coal zone and create a net coal thickness isopach map. Stratigraphic data were compiled into a Stratifact relational database. These data were correlated and the coal beds in the Wyodak-Anderson coal zone were identified. Stratigraphic data for the coal and rock units in the Wyodak-Anderson coal zone were downloaded from Stratifact and run through a custom "parting/split" program to calculate net coal thickness at each data location. The data were loaded into an EarthVision software program and the net coal thickness was gridded using the isopach grid option, four multiple data points (number of closest control points used for calculating a grid value), and a grid spacing of 300 x 300 meters. An isopach map was generated in EarthVision and was analyzed in detail. In areas where data were widely spaced and/or isopach lines were not reasonably accurate (based on known geologic factors) control points were added to the data set to better reflect the character of the coal thickness in those areas. Net coal thickness was regridded, new isopach maps constructed with a constant isopach line interval of 2.5 ft, and isopach lines were checked a final time for accuracy. The isopach map was then saved to a file in ASCII format. The ASCII file was modified using a custom program called ismarc. The new file was imported into ARC/INFO and generated as a polygon coverage using an Arc Macro Language (AML). This AML clipped the coverage to the study extent and assigned the net coal 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 2.5 and 5 ft was assigned a net coal thickness attribute of 3.75 ft). A new item was added to the polygon attribute table and populated with text labels corresponding to the coal thickness categories to be used for coal resource tables and graphic display (0-2.5 ft, 2.5-5 ft, 5-10 ft, 10-20 ft, 20-30 ft, 30-40 ft, 40-50 ft, 50-100 ft, 100-150 ft, 150-200 ft, 200-250 ft, and >250 ft). The coverage was then dissolved based on the text labels. The final coverage was projected to geographic and made into a shape file in ArcView. 1998 USGS Energy Resources Team Margaret Ellis 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 .0001 .0001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.0 298.257222 wacatg.dbf Shapefile Attribute Table None Area Area of polygon Software computed 0.00000 0.76941 Perimeter Perimeter of polygon Software computed 0.00020 25.64618 Thickness This field defines the net coal thickness of Wyodak-Anderson coal within individual polygons. User Defined Character field U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

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/P9KONIEZ 20210525 200710 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