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Geologic structure and altitude of the top of the Minnelusa Formation, northeastern Black Hills, South Dakota

Water-Resources Investigations Report 85-4233

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Abstract

This map shows the altitude of the top of the Permian--and Pennsylvanian age Minnelusa Formation, the deepest aquifer in the northeastern Black Hills for which there is sufficient data available to construct a structural map. The Minnelusa Formation outcrops in the western part of the map area and is more than 3 ,600 ft below land surface in the northeastern corner of the area. The formation consists of interbedded sandstone, sandy dolomite and limestone, shale, siltstone, gypsum, and anhydrite. The upper beds are an aquifer and the lower beds are a confining or semi-confining unit. Small anticlines and synclines parallel the Minnelusa outcrop. Domal structures and peaks in the study area are the result of Tertiary-age intrusions. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geologic structure and altitude of the top of the Minnelusa Formation, northeastern Black Hills, South Dakota
Series title:
Water-Resources Investigations Report
Series number:
85-4233
Edition:
-
Year Published:
1988
Language:
ENGLISH
Description:
1 map ; 55 x 80 cm., on sheet 91 x 128 cm.