Selected data for wells and test holes used in structure-contour maps of the Deadwood Formation in the Black Hills area, South Dakota.

Data on wells and test holes in this data set were used to identify elevations
for the top of the Deadwood Formation for the creation of a structure-contour
map. 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.

This dataset describes wells and test holes completed in the Deadwood Formation
that were used to create the structure-contours for the top of the Deadwood
Formation, Black Hills, South Dakota.

Well construction, well location, and related data were retrieved from drilling
records kept on file in the Rapid City, South Dakota, U.S. Geological Survey
office. Wells were eliminated from the list if no geologic log was available.
Values of latitude, longitude, and elevations of formation tops for wells were
used as input to ARC/INFO to create a point coverage of these wells.