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Lineaments and fracture traces, Jennings County and Jefferson Proving Ground, Indiana

Open-File Report 81-1120

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Abstract

Location of vertical or near-vertical bedrock fractures observed throughout the study area in Indiana are shown on a lineament and fracture trace map. Wells drilled on these mapped features may yield adequate supplies for domestic use. Large yields may be available in southwest Jennings County. Two nearly horizontal sequences of middle-Paleozic limestone and dolomite, separated by a thin discontinuous shale unit, constitute the prinicpal aquifer. Many wells in this aquifer fail to supply household needs, whereas others supply several households. All wells in the aquifer have been located for the owners ' convenience and are randomly located in relation to lineaments and fracture traces. Pleistocene drift, averaging 25-30 feet in thickness, did not restict lineament nad fracture-trace mapping. Well placement is important in this area, as fractures are a principal source of water to wells. In fractured bedrock areas, the most productive wells are at mapped lineament or fracture-trace intersections and at the lowest local altitude. Use of the lineament and fracture-trace map will not guarantee a sufficient ground-water supply, but it will minimize the chance of drilling an inadequate well. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Lineaments and fracture traces, Jennings County and Jefferson Proving Ground, Indiana
Series title:
Open-File Report
Series number:
81-1120
Edition:
-
Year Published:
1981
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
20 p., 1 over-size sheet, ill., maps ;28 cm.