U.S. Geological Survey 2006 vector digital data Scientific Investigations Report 2006-5129 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?SIR-06-5129_thickness_trinidad_con Watts, K.R. 2006 document Scientific Investigations Report 2006-5129 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2006/5129/ This digital geospatial data set consists of contours of lines of equal apparent thickness of the Trinidad Sandstone, the interval between the tops of the Trinidad Sandstone and the Pierre Shale, in Las Animas County, Colorado. The U.S. Geological Survey developed this data set as part of a cooperative project with the Colorado Water Conservation Board. Sources and interpretation of the data that were used to prepare this map are described in Scientific Investigation Report 2006-5129 (Watts, 2006). This data set was created to display the generalized apparent thickness of the Trinidad Sandstone in Las Animas County, Colorado. 2006 publication date Complete None planned -105.087420 -104.440001 37.385627 36.993196 ISO 19115 Topic Category inlandWaters Geographic Names Information System (GNIS) Colorado Las Animas County Geologic Names Lexicon (GEOLEX) Pierre Shale Trinidad Sandstone None This data set was prepared at a map scale of 1:400,000. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 {1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir-06-5129_thickness_trinidad_con krwatts@usgs.gov Compilation of this data set and associated metadata was done in cooperation with the Colorado Water Conservation Board. Technical review of this data set and metadata was provided by Steve Char of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_bottom_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_top_raton_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_top_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_top_vermejo_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_water_table_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_cogcc_production_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_cogcc_wells_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_bottom_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_top_raton_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_top_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_top_vermejo_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_water_table_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_formation_tops_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_seo_wells_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_thickness_raton_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_thickness_vermejo_con Johnson, R.b. 1969 document http://pubs.er.usgs.gov/usgspubs/i/i558 Green, G.N. 1992 vector digital data U.S. Geological Survey Open-File Report 92-507 Part A. Documentation Part B. Common files Part C. Explanation sheet database Part D-O. Geospatial data in ARC/INFO format http://pubs.usgs.gov/of/1992/ofr-92-0507/ Contour lines were visually inspected for topological errors (crossing or touching contours). No errors were detected. Includes only contours within the Raton Basin, Las Animas County, Colorado. Contours not well supported by data were deleted. Depths to the bottom and top surfaces of the Trinidad Sandstone were compiled from "scout cards" for wells in the on-line database of the Colorado Oil and Gas Conservation Commission (COGCC). The bottom of the Trinidad Sandstone is equal to the top of the Pierre Shale, where the Trinidad Sandstone is present. These data were used to generate the dKt and dKp attributes in sir-06-5129_formation_tops_point. 20060313 The input data set (sir-06-5129_formation_tops_point) was screened to select locations where depths to the top and bottom surfaces of the Trinidad Sandstone were greater than zero (0) feet; the calculated thicknesses of the Trinidad Sandstone were greater than zero (0) feet; and the absolute value of the datum error (datum_err attribute in sir-06-5129_formation_tops_point) was less than 25 feet or the datum error was not defined (datum_err = -9999). Thickness (isoKt attribute) of the Trinidad Sandstone, at its contact with the Veremjo Formation, was assigned a value of 123 feet) (the mean value of isoKt where defined at oil and gas wells) . Thickness (isoKt attribute) of the Trinidad Sandstone, at its contact with the Pierre Shale was assigned a value of zero (0) feet. Locations of contacts were interpolated from the geologic map of the Trinidad quadrangle (Johnson, 1969). 20060313 A geostatistical model of the apparent thickness of the Trinidad Sandstone was generated using the using the Geostatistcal Analyst model extension. The Geostatistical Analyst (raster data) of thickness of the Trinidad Sandstone was created using Ordinary Kriging. The input points, the Z value, was set to the isoKt field in sir-06-5129_formation_tops_point. The geostatistical model of the apparent thickness of the Trinidad Sandstone was run with the following parameters: Selected Method: Ordinary Kriging Output: Prediction Map Number of datasets in use: 1 Number of Points: 213 Order of Trend Removal: First (Estimated by Global Polynomial Interpolation) Ratio global to local drift: 1:0 Semivariogram/Covariance: Model: 0*Spherical(40866)+1241.2*Nugget Error modeling: Microstructure: 1241.2 (100%) Measurement error: 0 (0%) Searching Neighborhood: Neighbors to Include: 5 or at least 2 for each angular sector Searching Ellipse: Angle: 0 Major Semiaxis: 40866 Minor Semiaxis: 40866 Angular Sectors: 4 Lag Size: 3600 Number of Lags: 12 The model fit (prediction error statistics) of the geostatistical model of the apparent thickness of the Trinidad Sandstone were: Mean: -1.351 Root-Mean-Square: 35.86 Average Standard Error: 36.21 Mean Standardized: -0.03663 Root-Mean-Square Standardized: 0.9889 20060313 Contours were generated from the raster data, using the ESRI ArcGIS ArcMap, Spatial Analyst Tools, Surface function, Contour. 20060313 Contours were clipped to the study area to coincide with the data points used to create the raster. 20060313 The contour lines were exported to a coverage, using the ESRI ArcGIS ArcMap Conversion Tools, Feature Class To Coverage command. 20060313 The coverage was edited using the ArcEdit module of ESRI ArcGIS ArcInfo Workstation. Editing consisted of deleting small closed contours and contours not supported by nearby data points, and manually reshaping contours. 20060313 The edited coverage was exported to a shapefile and the contours were smoothed, using the ESRI ArcGIS Data Management Tools, Smooth function. 20060313 A line-style (dashed) attribute was added to the arcs. 20060313 Vector String 11 Albers Conical Equal Area 37.500000 40.000000 -105.500000 37.000000 0.000000 0.000000 coordinate pair 0.000128 0.000128 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 sir-06-5129_thickness_trinidad_con Apparent thickness of the Raton Formation U.S. Geological Survey Scientific Investigations Report 2006-5129 FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. CONTOUR Line of equal depth, evenly divisible by 30 USGS 120 150 feet U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-88-275-8747 (1888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir-06-5129_thickness_trinidad_con Downloadable Data Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. other no compression applied 0.015 http://water.usgs.gov/GIS/dsdl/SIR-06-5129_thickness_trinidad_con.zip None. This dataset is provided by the USGS as a public service. 20061013 20060922 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as Environmental Systems Research, Inc. (ESRI) ArcGIS format, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference purposes only. Acknowledgment of the U.S. Geological Survey and the Colorado Water Conservation Board would be appreciated in products derived from these data. Public Unclassified None http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile