Preparedincooperationwiththe SouthDakotaDepartmentofEnvironmentandNaturalResources andtheWestDakotaWaterDevelopmentDistrict Selected Data for Wells and Test Holes Used in Structure-Contour Maps of the Inyan Kara Group, Minnekahta Limestone, Minnelusa Formation, Madison Limestone, and Deadwood Formation in the Black Hills Area, South Dakota Open-FileReport99-260 Water table Alluvial aquifer Spring Flowing conduit well andPigrneceaomusbrrioacnkmsetamorDpheiacdwoodFCoramavteioMnadisonLimestone MMininnneeluksaahtaLimestonIneyanKaraGroup For mation U.S.DepartmentoftheInterior U.S.GeologicalSurvey Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. 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THIS PAGE SAR 57 unclassified unclassified unclassified Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std Z39-18 U.S. Department of the Interior U.S. Geological Survey Selected Data for Wells and Test Holes Used in(cid:3) Structure-Contour Maps of the Inyan Kara Group,(cid:3) Minnekahta Limestone, Minnelusa Formation,(cid:3) Madison Limestone, and Deadwood Formation(cid:3) in the Black Hills Area, South Dakota By Janet M. Carter Open-File Report 99-260 Prepared in cooperation with the(cid:3) South Dakota Department of Environment and Natural Resources(cid:3) and the West Dakota Water Development District U.S. Department of the Interior Bruce Babbitt, Secretary U.S. Geological Survey Charles G. Groat, Director The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. Rapid City, South Dakota: 1999 For additional information write to: District Chief(cid:3) U.S. Geological Survey(cid:3) 1608 Mt. View Road(cid:3) Rapid City, SD 57702 Copies of this report can be purchased from: U.S. Geological Survey(cid:3) Information Services(cid:3) Box 25286(cid:3) Denver, CO 80225-0286 CONTENTS Abstract.................................................................................................................................................................................. 1 Introduction........................................................................................................................................................................... 1 Methods of Station Identification.......................................................................................................................................... 4 Well and Test-Hole Data........................................................................................................................................................ 6 References............................................................................................................................................................................. 6 ILLUSTRATIONS 1. Map showing area of investigation for the Black Hills Hydrology Study.................................................................. 2 2. Stratigraphic section for the Black Hills..................................................................................................................... 3 3. Schematic showing simplified hydrogeologic setting of the Black Hills area........................................................... 4 4. Diagram showing system for assignment of local numbers....................................................................................... 5 TABLES 1. Selected data for wells and test holes used in the structure-contour map of the Inyan Kara Group....................... 9 2. Selected data for wells and test holes used in the structure-contour map of the Minnekahta Limestone............... 18 3. Selected data for wells and test holes used in the structure-contour map of the Minnelusa Formation................. 30 4. Selected data for wells and test holes used in the structure-contour map of the Madison Limestone.................... 45 5. Selected data for wells and test holes used in the structure-contour map of the Deadwood Formation................. 50 Contents I Selected Data for Wells and Test Holes Used in Structure-Contour Maps of the Inyan Kara Group, Minnekahta Limestone, Minnelusa Formation,(cid:3) Madison Limestone, and Deadwood Formation(cid:3) in the Black Hills Area, South Dakota By Janet M. Carter ABSTRACT exposed in the central core of the Black Hills. Surrounding the Precambrian core is a layered series of This report presents selected data on wells sedimentary rocks including limestones, sandstones, and test holes that were used in the construction of and shales that are exposed in roughly concentric rings structure-contour maps of selected formations that around the uplifted flanks of the Black Hills. The contain major aquifers in the Black Hills area of bedrock sedimentary units typically dip away from the western South Dakota. Altitudes of the top of the uplifted Black Hills at angles that approach or exceed Inyan Kara Group, Minnekahta Limestone, 10degrees near the outcrops, and decrease with Minnelusa Formation, Madison Limestone, and distance from the uplift. Many of the sedimentary units Deadwood Formation are presented for the wells contain aquifers, both within and beyond the study and test holes presented in this report. area. Major aquifers in the study area include the Inyan Kara, Minnekahta, Minnelusa, Madison, and Dead- wood aquifers (fig.3). Recharge to these aquifers INTRODUCTION occurs from infiltration of precipitation upon the outcrops and, in some cases, from infiltration of The Black Hills Hydrology Study was initiated streamflow (Hortness and Driscoll, 1998). Artesian in 1990 to assess the quantity, quality, and distribution conditions generally exist within these aquifers, where of surface water and ground water in the Black Hills an upper confining layer is present. Flowing wells and area of South Dakota (Driscoll, 1992). This long-term artesian springs that originate from confined aquifers study is a cooperative effort between the U.S. Geolog- are common around the periphery of the Black Hills. ical Survey (USGS), the South Dakota Department of The purpose of this report is to present selected Environment and Natural Resources, and the West data for wells and test holes that were used in the Dakota Water Development District, which represents construction of maps showing the altitude of the tops of various local and county cooperators. selected formations (structure contours) within the The study area (fig.1) consists of the topo- study area. The structure-contour maps presented by graphically defined Black Hills and adjacent areas Carter and Redden (1999a, 1999b, 1999c, 1999d, located in western South Dakota. The Black Hills area is an elongated, dome-shaped feature, about 125miles 1999e) were produced at a scale of 1:100,000 for the long and 60miles wide, which was uplifted during the Inyan Kara Group, Minnekahta Limestone, Minnelusa Laramide orogeny (Feldman and Heimlich, 1980). The Formation, Madison Limestone, and the Deadwood oldest geologic units in the study area are Precambrian Formation. Altitudes of the top of the these formations metamorphic and igneous rocks (fig.2), which are are presented for the wells and test holes in this report. Introduction 1 (cid:3) 2 Data for Wells and Test Holes Used in Structure-Contour Maps, Black Hills Area, South Dakota Introduction 3 METHODS OF STATION IDENTIFICATION The second method is the station identification number, which is based on the international system of Two methods of station identification are used latitude and longitude. The number contains 15 digits. within this report to identify sites for which data are The first six digits denote the degrees, minutes, and presented. The first method is the local number, which seconds of latitude north of the equator. The next seven is based on the Federal land-survey system for western digits denote the degrees, minutes, and seconds of South Dakota (fig.4). The local number consists of the township number followed by “N” or “S” (north or longitude west of the prime (Greenwich) meridian. In south of the Black Hills Baseline), the range number cases where the latitude and longitude were determined followed by “E” or “W” (east or west of the Black Hills to the tenths of degrees, the latitudes and longitudes Meridian), and the section number, followed by a were rounded to the nearest second in the corre- maximum of four uppercase letters that indicate, sponding station identification number. The last two respectively, the 160-, 40-, 10-, and 2.5-acre tract in digits are sequential numbers for sites located at the which the site is located. These letters are assigned in same latitude and longitude. The latitudes or longi- a counterclockwise direction beginning with “A” for tudes originally assigned to sites occasionally are the northeast quarter. A serial number following the determined to be incorrect. In these cases, the latitude last letter is used to distinguish between wells located or longitude is corrected, but the station identification in the same 2.5 acre-tract. Thus, well 4N6E19AABA (fig.4) is in the NE1/4 of the NW1/4 of the NE1/4 of number remains unchanged. Thus, the latitude or the NE1/4 of section 19 in township 4 north and range longitude may not correspond exactly with the station 6 east. identification number. 4 Data for Wells and Test Holes Used in Structure-Contour Maps, Black Hills Area, South Dakota