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_alt_top_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 data set consists of structure contours that show lines of equal altitude of the top of the Trinidad Sandstone, the contact between the Trinidad Sandstone and Vermejo Formation, 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. This data set was created to display the generalized configuration and altitude of the top of the Trinidad Sandstone in Las Animas County, Colorado. 2006 publication date Complete None planned -105.111839 -104.235171 37.426542 36.987678 ISO 19115 Topic Category inlandWaters geoscientificInformation Geographic Names Information System (GNIS) Las Animas County Colorado Geologic Names Lexicon (GEOLEX) Trinidad Sandstone Vermejo Formation 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_alt_top_trinidad_con 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. Public Unclassified None 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_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 tabular 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_trinidad_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 U.S. Geological Survey Miscellaneous Investigations Series Map I-558, scale 1:250,000, reprinted in 1983 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, where supported by data. U.S. Geological Survey 1969 document Miscellaneous Geologic Investigations Map I-558 Washington D.C. U.S. Geological Survey 250000 paper 1969 publication date Johnson (1969) Location and altitude of contact of the Trinidad Sandstone and Vermejo Formation Depths to the top of the Trinidad Sandstone, the dTKr attribute in sir-06-5129_formation_tops_point, were compiled from "scout cards" for wells in the on-line database of the Colorado Oil and Gas Conservation Commission (COGCC); and altitudes of the outcrop of the contact of the Trinidad Sandstone with the Vermejo Formation were interpolated from a geologic map (Johnson, 1969). 20060313 The input data set, the dKt attribute in sir-06-5129_formation_tops_point, was screened to select locations where depth to the Trinidad Sandstone was greater than zero (0) and the reported land-surface altitude was within 25 feet of the land-surface altitude that was interpolated from the National Elevation Dataset (1/3 Arc-second resolution). The altitude of the top of the Trinidad Sandstone, the aKt attribute in sir-06-5129_formation_tops_point, was calculated by subtracting the reported depth to the top of the Trinidad Sandstone (dKt attribute) from the interpolated land-surface altitude (datum attribute in sir-06-5129_formation_tops_point). 20060313 A geostatistical model of the altitude of the top of the Trinidad Sandstone was generated using the using the Geostatistcal Analyst extension. The Geostatistical Analyst model (raster data)of altitude of the top of the Trinidad Sandstone was created using Ordinary Kriging. The input points, the Z value, was set to the aKt attribute in sir-06-5129_formation_tops_point. The geostatistical model of the altitude of the top 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: 819 Order of Trend Removal: First (Estimated by Global Polynomial Interpolation) Ratio global to local drift: 1:0 Semivariogram/Covariance: Model: 242620*Spherical(44450)+0*Nugget Error modeling: Microstructure: 0 (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: 44450 Minor Semiaxis: 44450 Angular Sectors: 4 Lag Size: 3750 Number of Lags: 12 The model fit (prediction error statistics) of the geostatistical model of the altitude of the top of the Trinidad Sandstone were: Mean: -8.39 Root-Mean-Square: 212 Average Standard Error: 80.93 Mean Standardized: -0.0153 Root-Mean-Square Standardized: 1.001 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 data. 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 converted to a shapefile and the contours were smoothed, using the ESRI ArcGIS ArcMap, Data Management Tools, Smooth function. 20060313 A line-style (solid or dashed) attribute was added to the arcs based on distance from control points. The line-style was defined as solid when the arc was within 2,400 meters of a control point and dashed when more than 2,400 meters from a control point. 20060313 Vector String 79 Albers Conical Equal Area 37.500000 40.500000 -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 North American Vertical Datum of 1988 100 feet Attribute values sir-06-5129_alt_top_trinidad_con Altitude of the top of the Trinidad Sandstone 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 altitude, evenly divisible by 200 USGS 4800 9000 feet, North American Vertical Datum 1988 (NAVD 88) line Contour style (solid or dashed) USGS soli Solid line, indicating contours are well supported by data USGS dash Dashed line, indicating that contours are approximately located and poorly supported by data USGS index Contour type (index or intermediate) USGS 0 Intermediate contour USGS 1 Index contour, every fifth contour, evenly divisible by 1,000 USGS 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_alt_top_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 0.054 http://water.usgs.gov/GIS/dsdl/SIR-06-5129_alt_top_trinidad_con.zip None. This dataset is provided by 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