Mercier, Tracey J 2009 Downloadable GIS data U.S. Geological Survey Digital Data Series DDS-69-Y Reston,VA U.S. Geological Survey https://doi.org/10.5066/P91D2XY0 Tracey J. Mercier Gregory L. Gunther Christopher C. Skinner 2009 model U.S. Geological Survey Digital Data Series DDS-69-Y Denver, Colorado U.S.Geological Survey https://pubs.usgs.gov/dds/dds-069/dds-069-y/ An ESRI GRID raster data model of the overburden material above the Mahogany Zone was needed to perform calculations in the Piceance Basin, Colorado as part of a 2009 National Oil Shale Assessment. Increasing energy demand, changing economics, new technology, and geopolitical issues have spurred renewed interest in other energy alternatives such as oil shale, heavy oil, and tar sands. The USGS Energy Resources Program has previously conducted extensive field and geologic research on these commodities and is initiating an effort to inventory and make these important legacy information assets accessible to the public, land managers, and other decision-makers. In addition, the Energy Program is scoping the geologic, technical, economic, and environmental factors controlling the production and use of these energy sources and will provide recommendations for future research in order to meet the energy needs of the United States. 2009 publication date Complete As needed -108.775514 -107.727222 40.190224 39.249306 19270.942914 107823.022914 131454.483374 28270.953374 ISO 19115 Topic Category geoscientificInformation Gateway to the Earth draft 9 28-Jun-2002 Oil shale resources Economic geology None Energy resources Oil shale Oil Resource assessment Earth science Natural resources U.S. Geological Survey USGS Geology USGS Energy Resources Science Center Thesaurus Eocene Green River Formation Structure Mahogany ledge Mahogany Overburden EnergyResourceActivities oilshale piceanceoilshale USGS Metadata Identifier USGS:60de1455d34e3a6dca2956b2 None United States Piceance Basin CO Colorado none This dataset is appropriate for regional-scale analysis at scales of 1:100,000 or less. 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://certmapper.cr.usgs.gov/data/oil_shale/graphic/piceance_location.jpg Thumbnail view of Piceance Basin JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 The accuracy of the data contained in this raster model is a reflection of the accuracy of the data contained in the original source maps, the scale of the source maps, the scale at which the original linework was digitized, and the interpolations and extrapolations of the source values during vector to raster conversion. The raster model contains cell values based on the thickness of overburden and variations (through interpolation and extrapolation) of those values above the Mahogany zone in the Piceance Basin, Colorado. All raster models have been peer-reviewed and are found to be geologically reasonable and accurate. Hail, W. J. Smith, M. C. 1994 map U.S. Geological Survey Miscellaneous Investigation Map I-2400 Denver, Colorado U.S. Geological Survey https://pubs.er.usgs.gov/publication/i2400 1:100,000 paper outcrop and structure contour lines for the Mahogany ledge or zone Hail, W. J. Smith, M.C. 1997 map U.S. Geological Survey Miscellaneous Investigation Map I-2529 Denver, Colorado U.S. Geological Survey https://pubs.er.usgs.gov/publication/i2529 1:100,000 paper outcrop and structure contour lines for the Mahogany ledge or zone U.S. Geological Survey 1999 1 raster digital data Sioux Falls, SD U.S. Geological Survey https://ned.usgs.gov/ online National Elevation Dataset (NED) Elevation information. The original paper source maps were scanned, registered, and rectified and the top of the Mahogany ledge outcrop and structure contour lines were digitized in ArcGIS v. 9.1. Gaps in coverage near Battlement Mesa were contoured by hand by staff geologist and transferred to the digital polyline file. The structure contour lines were converted to a point file containing elevation values for the top of the Mahogany zone. For the Mahogany outcrop line surface elevation values in feet were extracted from a Digital Elevation Model (DEM) to obtain elevation values for the Mahogany ledge. The two point files were merged to generate a surface model in ArcGIS by using the GeoStatistical Analyst's Radial Basis Function (RBF) contouring method. The RBF surface model was converted to an ESRI GRID. The Mahogany surface GRID was then subtracted from a DEM GRID using the ArcGIS Spatial Analyst Raster Calculator. The resultant GRID contains values of total overburden, in feet, above the Mahogany zone for each one-acre cell. 2009 U.S. Geological Survey, Energy Resources Science Center Tracey J. Mercier IT Specialist mailing and physical address

U.S. Geological Survey, Box 25046, MS 939, Denver Federal Center

Denver Colorado 80225 USA 303 236 5088 303 236 0459 tmercier@usgs.gov Raster Grid Cell 1622 1392 1 Lambert Conformal Conic 33.000000 45.000000 -109.000000 39.000000 0.000000 0.000000 row and column 63.615000 63.615000 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 mhg_ob_g.vat Mahogany zone overburden value attribute table U.S. Geological Survey Rowid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE thickness of overburden, in feet U.S. Geological Survey COUNT 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/P91D2XY0 20210701 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 Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time https://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile