Top coal structure contours of the Zone 5 coal bed in Northeast Texas

U.S. Geological Survey 2011 Top coal structure contours of the Zone 5 coal bed in Northeast Texas AAPG Discovery Series/AAPG Studies in Geology No.14/No. 62 vector digital data Tulsa, OK American Association of Petroleum Geologists U.S. Geological Survey 2011 Geologic Assessment of Coal in the Gulf of Mexico Coastal Plain, U.S.A. z5top withheld This data set is a polygon coverage of the top of Zone 5, in feet, over extent of the Zone 5 coal and its horizon (stratigraphic equivalent) in Northeast Texas only. The coverage was produced by gridding more than 600 public and confidential point- source data from the National Coal Resources Data System (NCRDS) of the USGS, using EarthVision (Version 4.0.2) software, subsequently contoured into 6-inch intervals, and imported to ARC/INFO. The 'top' item for each polygon reflects a value in feet halfway between the bounding contour lines. This value represents results of gridding which averages point values within cells, therefore, public point data may not always match values represented in the top of coal structure data layer. This data set was used in the National Coal Resource Assessment Program in the regional evaluation of resources for the coal Zone 5 in the Gulf Coast region. The data set is useful for regional studies- not applicable to local scales. en 1970's 1997 publication date Complete None planned -95.835 -94.774 33.269 32.649 -95.835434 -94.773514 32.649406 33.268707 Theme_Keyword_Thesaurus coal coal resources coal top lignite isopach outcrop USGS Geographic Names Information System Gulf Coast Region Camp County, TX Franklin County, TX Hopkins County, TX Rains County, TX Titus County, TX Van Zandt County, TX Woods County, TX Stratum_Keyword_Thesaurus Wilcox Group Paleocene-Eocene none none Peter D. Warwick mailing address

MS 956 National Center

Reston Virginia 20192 USA 703-648-6469 Geologist pwarwick@usgs.gov The stratigraphic data stored in the NCRDS has been submitted by State Geological Surveys and USGS scientists since its inception in the middle 1970's through state cooperative programs. The data for the Zone 5 coal bed was used with the permission and through the cooperation of coal geologists (primary contacts listed) at the State of Texas Bureau of Economic Geology and the State of Texas Railroad Commission ESRI ArcCatalog 9.3.1.3000 Shapefile The range of top values in the point-source information was 0 to 16.50 feet. The resultant range of the gridded surface was 0-20 feet; extrapolation was used over the x,y extent. The average absolute Z-error of the grid was 2.85 percent of the range. Topologically clean Input points were irregularly distributed over the spatial extent of the study, therefore areas of sparse data will not reflect ground truth. Zone 5 cumulative coal tops were selected by name from the stratigraphic data base stored in StratiFact, a relational data base manager in use by the USGS National Coal Assessment. The original data submitted to NCRDS may not have had the Zone identified, a task performed within StratiFact by examining data in cross sections. Data used were selected by geologist from the database. NCRDS, USGS 1995 NCRDS Digital Data Set on-line data base 1995 2000 publication date NCRDS- National Coal Resources Data System;BEG-Bureau of Economic Geology; RRC-Railroad Commission NCRDS- point-source data Zone 5 data from NCRDS printed and verified against original data sources where possible. New data collected from the BEG and the RRC, and entered into NCRDS. 1995-1997 Corrections made to NCRDS (including the new BEG and RRC data) in StratiFact. 1996-1997 Editing and correlation of individual data bases in StratiFact to eliminate data coding differences between data sets. 1997 Editing of tops and further addition and refinement of data values to place in StratiFact data bases. The data were filtered in StratiFact and filtered in EarthVision (v.4.0.2) in geographic coordinates. The data are gridded and grid parameters used were a default 300 x 300 grid, X range -95.90438 to -94.69272, Y range 32.62942 to 33.30208, extrapolation of values over specified x,y extent plus 5%. Contour intervals at irregular intervals at 0-1.5 ft,1.5-2.5 ft, 2.5-5 ft, 5-10 ft, 10-20 ft, 20-30 ft. to follow USGS Circular 891 1998 Grid was contoured in EarthVision into 0.5-foot intervals, using 0 to 30 feet as limits. Contour file was graphically edited in EarthVision to fit the geology of the area. 1998 Grid was projected into Albers and regridded using the original graphically edited grid to decrease the cell size so that the small polygons in the limiting unioned coverage used for volume calculations will have a grid value to use for each small 3350 x 2500.. 1998 Import of contours to ARC/INFO for the entire area, using conversion ARC/INFO AML provided by Illinois State Geological Survey, and rectangular area ARC coverage (box) to enclose polygons. Polygons graphically labeled in ARC/EDIT using midpoint value for upper and lower bounding contours. The 0, 0.75, 2, 3.75, 7.5, 15, 25 (ft). 1998 New attribute item "top" added and calculated from the polygon value. Added item for top category and populated it by graphically selecting desired polygons by top and calculating the category value. 1998 Arc/Info coverages were projected to geographic coordinates, converted to shape Arc/View shape files and imported into Arc/View. 1998 North American Datum of 1927 Clarke 1866 6378206.46378206.4 294.982943.98 DD_NAD83 z5top.dbf polygon attribute table for coverage ARC/INFO Feature Class 0 OBJECTID FID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. edx_sp_ree_coal_od.sde.REE0433_z5top_Northeast_Texas_Coal_Zone_5_Structural_Top_feet.area edx_sp_ree_coal_od.sde.REE0433_z5top_Northeast_Texas_Coal_Zone_5_Structural_Top_feet.area Double 8 38 8 Shape Shape Geometry 8 0 0 Feature geometry. ESRI Coordinates defining the features. AREA AREA Double 8 0 0 PERIMETER PERIMETER Double 8 38 8 elev_st average top value of bounding contour lines ARC/INFO 125 475 ELEV_ST Double 8 38 8 source_organization Source Organization String 255 0 0 dataset_name Dataset Name String 255 0 0 hyperlink Link String 255 0 0 dateupdated Date Last Updated String 255 0 0 st_area(shape) st_area(shape) Double 0 0 0 st_perimeter(shape) st_perimeter(shape) Double 0 0 0 source_ID Source ID String 255 0 0 mailing address

P. O. Box 979

Tulsa OK 74101-0979 USA 1 800 364 2274 American Association of Petroleum Geologists 1 918 560 2665 Northeast Texas Zone 5 coal data set The US Geological Survey provides these geographic data "as is". USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. USGS further makes no warrantees, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of the USGS, no warranty, expressed or implied, is made by USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the delivery, installation, operation, or support by USGS. ARCE 0.126 0.126 withheld none 2011 Peter D. Warwick mailing address

MS 956 National Center

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