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Lineaments and fracture traces, Decatur County, Indiana

Open-File Report 82-918

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Abstract

Lineaments and fracture traces were mapped in Decatur County. Observed throughout the county, these features overlie vertical bedrock fractures. Wells drilled on these mapped features may yield adequate supplies for domestic and larger needs. Two nearly horizontal sequences of mid-Paleozoic limestone and dolomite, separated by a thin discontinuous shale unit, constitute the principal aquifer. Many wells in this aquifer fail to supply household needs, whereas others are used for municipal supply. Wells in the aquifer have been located for the owner 's convenience and are randomly located in relation to lineaments and fracture traces. Pleistocene glacial drift, averaging about 150 feet thick, did not restrict lineament and fracture-trace mapping. Well placement is very important in this area, as fractures are a principal source of water to wells. In fractured bedrock areas, the most productive well locations 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 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, Decatur County, Indiana
Series title:
Open-File Report
Series number:
82-918
Edition:
-
Year Published:
1983
Language:
ENGLISH
Description:
1 map ;74 x 70 cm., folded in envelope 31 x 24 cm. +1 pamphlet (21 p. ill., maps ; 28 cm.)