United States Geological Survey 19990930 Downloadable GIS Data 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/P9ZSJCUT This ArcView shape file contains a line representation of the Knobloch coal bed outcrop or contact with clinker in the Ashland coalfield as defined in the USGS National Coal Resource Assessment (NCRA) project. This theme was created specifically for the National Coal Resources 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). The Knobloch coal bed outcrop theme represents a digital line (arc) coverage compiled from published geologic mapping conducted primarily by the Montana Bureau of Mines and Geology. The outcrop represents either (1) the trace of the exposed Knobloch coal bed in outcrop, or (2) the contact between the unburned Knobloch coal bed and adjacent clinker deposits where the Knobloch coal bed has burned. No information is presented for the Knobloch coal bed outcrops within the Northern Cheyenne Indian Reservation. The Knobloch coal bed outcrop coverage is used, in part, to define the areal limits for coal resource assessment of the Knobloch coal resource unit as part of the National Coal Resource Assessment (NCRA) project of the U.S. Geological Survey. As defined here, the "Knobloch coal resource unit" represents the single, thick bed of coal formed by the merging of multiple coal beds in northern areas of the Ashland coalfield as well as representing the uppermost coal bed in the "Knobloch coal zone" where the thick coal bed has split into multiple coal beds in southern, western, and eastern areas of the coal field. In all cases, the Knobloch coal resource unit represents a single coal bed. The Knobloch coal bed outcrop coverage is based on published maps at scales of 63,360 and 100,000. The majority of the coverage was compiled at a 100,000 scale of resolution, and it is strongly recommended that user application of this coverage should not exceed this level of detail. The trace of the outcrop (or clinker contact) was transferred from original maps (folded paper copies) to a base stable medium (mylar) and registered using bounding control points in geographic (latitude and longitude) coordinates. Separate mylars were then electronically scanned to develop TIFF images and the images were then rectified in ARC/INFO for use as templates for subsequent on-screen digitizing of the outcrop line. Individual line (arc) coverages from the different map sources were then joined to form a single, composite line coverage for the Knobloch coal bed. This line (arc) coverage was then generalized using a weed tolerance of 30 meters to reduce file size. The generalized cover was then converted to a shapefile for incorporation as a theme in the ARCVIEW project. Although this coverage is generally representative of previous geologic mapping pertaining to the Knobloch coal bed in the Ashland coalfield and surrounding areas, no attempt was made to field check the final coverage for verification of its accuracy and completeness. 1999 publication date Complete None planned -106.5337 -105.7112 45.8633 45.3417 None Knobloch Coal Bed Outcrop Clinker Contact Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment ArcIMS Metadata Server Theme Codes geoscientificInformation economy environment EnergyResourceActivities coal nca2000 nrockiescoal powderbasincoal None Ashland Coalfield Rosebud County Powder River County Montana Powder River Basin Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment USGS Metadata Identifier USGS:60ac0a26d34ea221ce51fe26 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/60ac0a26d34ea221ce51fe26?f=__disk__05%2F9f%2Fb0%2F059fb05663405a45c43a841860f4cf6b54a49925 Thumbnail view of the Knobloch outcrop ArcView 3.0 ARC/INFO 7.1.2 SUNOS, 5.6 SUN4U, UNIX No test for accuracy was performed. line features present Outcrop line is limited to the Knobloch Coal Resource Unit in the Ashland coalfield as defined in the USGS National Coal Resource Assessment project. Limited to software coordinate precision for geographic coordiantes Derkey, P.M.(comp.) 1986 map Montana Bureau of Mines and Geology Geologic Map Geologic Map No. 43 1:100000 paper unknown ground condition None The outcrop or clinker contact of the Knobloch coal bed in the part of the Ashland coalfield within the Lame Deer 30'x60' quadrangle was developed from this source. Matson, R.E.(comp.) Blumer, J.W.(comp.) 1973 map Montana Bureau of Mines and Geology Bulletin Bulletin 91 1:63,360 paper 1973 Ground Condition None The outcrop or clinker contact of the Knobloch coal bed in the part of the Ashland coalfield within the Powderville 30'x60' quadrangle (Foster Creek area) was compiled from this source. The Knobloch coal bed outcrop (or clinker contact) coverage is based on analog map data compiled at scales of 63,360 (15' quadrangle map compilation) and 100,000 (30' x 60' quadrangle map compilation). The majority of the coverage was captured at a 100,000 scale of resolution, and it is strongly recommended that user application of this coverage should not exceed this level of detail. The trace of the outcrop (or clinker contact) was transferred from original maps (folded paper copies) to a base stable medium (mylar) and registered using bounding control points in geographic (latitude and longitude) coordinates. Separate mylars were then electronically scanned to develop TIFF images and the images were then rectified in ARC/INFO for use as templates for subsequent on-screen digitizing of the outcrop line. Individual line (arc) coverages from the different map sources were then joined to form a single, composite line coverage for the Knobloch coal bed. This line (arc) coverage was then generalized using a weed tolerance of 30 meters to reduce file size. The generalized cover was then converted to a shapefile for incorporation as a theme in the ARCVIEW project. Although this coverage is generally representative of previous geologic mapping pertaining to the Knobloch coal bed in the Ashland coalfield and surrounding areas, no attempt was made to field check the final coverage for verification of its accuracy and completeness. 19990700 USGS Central Region Energy Resources Team Steve Roberts Geologist mailing address

Box 25046 MS 939 Denver Federal Center

Denver CO 80225-0046 USA 303.236.7788 sroberts@usgs.gov Vector Complete Chain 149 .0001 .0001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.0 298.257222 knocg.dbf Shapefile Attribute Table None Length Length of line Software computed 2.9580 75023.0000 Fnode_ From-node identifier of linear feature Software computed 1 173 Tnode_ To-node identifier of linear feature Software computed 1 174 Lpoly_ Internal number of polygon to left of arc Software computed 0 0 Rpoly_ Internal number of polygon to right of arc Software computed 0 0 Length Length of line Software computed 3.09794 11267.38000 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/P9ZSJCUT 20210524 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