Joel M. Galloway, U.S. Geological Survey 2000 (Version 1.0, December 27, 2000) digital map NA NA Rapid City, South Dakota U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sd_mdsn_thk This data set is a polygon coverage created in ARC/INFO that represents the generalized thickness of the Madison Limestone and Englewood Formation, Black Hills, South Dakota. The thickness of the Madison Limestone and Englewood Formation was determined by substracting the elevation of the top of the Deadwood Formation from the elevation of the top of the Madison Limestone. The elevations for the tops of the formations were determined from geologic logs for wells drilled as of 1998. The thickness coverage contains polygons that have single integer values representing a range of thickness. This data set was created as part of the Black Hills Hydrology Study (BHHS). The BHHS is a long-term investigation that was initiated in 1990 as a cooperative effort between the U.S. Geological Survey (USGS), the South Dakota Department of Environment and Natural Resources (DENR), and the West Dakota Water Development District. West Dakota represents various local and county cooperators. The purpose of the study is to assess the quantity, quality, and distribution of surface and ground water in the Black Hills area of western South Dakota (Driscoll, 1992). The study area includes parts of Butte, Custer, Fall River, Lawrence, Meade, and Pennington counties in South Dakota. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. Reviews_Applied_to_Data: This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. The reviewers checked the metadata for completeness and accuracy. Related_Spatial_and Tabular_Data_Sets: Generalized thickness of the Minnelusa Formation (sd_mnls_thk), saturated thickness of the Minnelusa aquifer (sd_mnlsst_thk) and saturated thickness of the Madison aquifer (sd_mdsnst_thk). Other_References_Cited: Driscoll, D.G., 1992, Plan of study for the Black Hills Hydrology Study, South Dakota: U.S. Geological Survey Open-File Report 92-84, 10 p. 20001227 The thicknesses were based on geologic logs for selected wells drilled as of 1998. Complete None Planned -104.07994226 -102.95291642 44.78631611 43.11713452 none geology thickness Madison Limestone Englewood Formation inlandWaters none Black Hills South Dakota USA none These data should not be used at scales larger than 1:100,000. Janet Carter U.S. Geological Survey Hydrologist mailing and physical address

1608 Mt. View Rd.

Rapid City South Dakota 57702 USA 1-888-275-8747 (605) 355-4523 (jmcarter@usgs.gov) Compilation of this data set and the associated metadata was funded by the U.S. Bureau of Reclamation. SunOS, 5.6, sun4u UNIX ARC/INFO version 8.0.1 Janet Carter, U.S. Geological Survey 1999 paper map USGS Hydrologic Investigations Atlas HA-744-D Rapid City, South Dakota U.S. Geological Survey Janet Carter, U.S. Geological Survey 1999 paper map USGS Hydrologic Investigations Atlas HA-744-C Rapid City, South Dakota U.S. Geological Survey Multiple visual checks were done to verify that the attribute data was coincident with the original source map. Polygon and chain-node topology present. This data set consists of polygons with codes indicating ranges of thickness of the Madison Limestone and Englewood Formation in the vicinity of the Black Hills, South Dakota. none Joyce Williamson, U.S. Geological Survey 2000 digital maps Open-File Report OFR 00-471 Rapid City, South Dakota U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr00471_mdsnscon http://water.usgs.gov/lookup/getspatial?ofr00471_ddwdscon http://water.usgs.gov/lookup/getspatial?ofr00471_mdsnsurf 100000 digital maps 2000 Ground condition based on published data as of 1999 none Coverages of the geologic structure contours for the top of the Madison Limestone (mdsnscon), the geologic structure contours for the top of the Deadwood Formation (ddwdscon), and a coverage of the overlying surficial deposits and absent areas for the Madison Limestone (mdsnsurf), Black Hills area, South Dakota. Dan Driscoll, U.S. Geological Survey 1992 map Open-File Report OFR 92-84 Rapid City, South Dakota U.S. Geological Survey 100000 digital map none none The digital coverage of the study area perimeter was used as a boundary for the formation thickness analysis. The following terminology used to describe the creation of the data set is from ARC/INFO. First, a polygon coverage of the study area boundary was converted to a grid coverage (bordergrd) using the POLYGRID command. The bottom of the Englewood Formation was determined by adding the thickness of the Whitewood and Winnepeg Formations to the elevation of the structural top of the Deadwood Formation. The thickness of the Whitewood and Winnipeg Formations in the study area was estimated from geologic logs to create a point coverage. The coverage was converted to a line coverage by contouring the points using the TOPOGRID and LATTICECONTOUR commands. Line coverages containing elevation contours of the structural surface of the Madison Limestone (mdsnscon) and the Deadwood Formation (ddwdscon), and the thickness of the Whitewood and Winnepeg Formations (wwdthk_cov) were converted to grids using command TOPOGRID with a cellsize of 50 meters, and with the border defined by the grid of the study area (bordergrd). Example: Arc: TOPOGRID mdsntop_grd 50 TOPOGRID: border bordergrd TOPOGRID: datatype contour TOPOGRID: contour mdsnscon elev TOPOGRID: end Using GRID, the thickness grid of the Whitewood and Winnepeg Formations (wwdthk2_grd) was added to the structural surface elevation grid of the Deadwood Formation (ddwdtop_grd). This new grid was then subtracted from the structural surface elevation grid of the top of the Madison Limestone (mdsntop_grd) to create a grid of the thickness of the Madison Limestone and Englewood Formation (mdsnthk_grd). The output grid was then reclassed into 6 general categories of thickness using a REMAP file (mdsnthk_remap) to assign a range of values to a single integer value for an item named GRID-CODE. GRID: mdsnbot_grd = ddwdtop_grd + wwdthk2_grd GRID: mdsnthk_grd = mdsntop_grd - mdsnbot_grd GRID: mdsn_recg = reclass(mdsnthk_grd, mdsnthk_remap) The grid was next converted to a polygon coverage using the GRIDPOLY command in GRID and the CLEAN command in ARC. Finally, very small polygons in the coverages that had areas less than 5000 square meters and greater than 0 were eliminated using the ARC command ELIMINATE. 20000531 First draft of metadata created by jgallowa using FGDCMETA.AML ver. 1.33 07/15/99 on ARC/INFO data set /home/bhhs/gis/jmg/aquiprop/metathick/mdsn_thk 20001227 Excessive pseudo nodes were removed in ARCEDIT and polygon labels were editted for unique poly IDS using TABLES and IDEDIT. 20010413 Vector Point 861 String 1435 GT-polygon composed of chains 862 Point 14 Transverse Mercator 0.999600 -105.000000 500000.000000 0.000000 coordinate pair 1.0 1.0 Meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 sd_mdsn_thk.pat FID SHAPE AREA PERIMETER SD_MDSN_THK# SD_MDSN_THK-ID GRID-CODE > >SD_MDSN_THK.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 4 12 F 3 > 5 PERIMETER 4 12 F 3 > 9 SD_MDSN_THK# 4 5 B - > 13 SD_MDSN_THK-ID 4 5 B - > 17 GRID-CODE 4 8 B - > > AREA - Internal number for the area of the polygon in square meters PERIMETER - Internal number for the perimeter of the polygon in meters SD_MDSN_THK# - Internal sequence number (i.e. the record number) of the polygon in the ARC file SD_MDSN_THK-ID - User assigned feature ID GRID-CODE - An integer number indicating a range of thickness according to the following table: GRID-CODE Range in thickness (ft) 1 less than 200 2 200-400 3 400-600 4 600-800 5 800-1000 -9999 no data and areas where the formation is absent none U.S. Geological Survey Ask USGS - Water Webserver Team mailing

507 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sd_mdsn_thk 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. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/sd_mdsn_thk.e00.gz SDTS Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/sd_mdsn_thksdts.tgz Other Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/sd_mdsn_thkshp.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sd_mdsn_thk FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998