Geologic units in Clark county, Indiana

Borden Group (Mississippian) at surface, covers 28 % of this area

Mostly siltstone; lenses of crinodial limestone in upper part. Much cherty and silty limestone and dolomite in northwest. NP, top of New Providence Shale

New Albany Shale (Devonian-Mississippian) at surface, covers 28 % of this area

Black and greenish-gray shale

Muscatatuck Group (Devonian) at surface, covers 25 % of this area

Limestone and dolomite

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers 12 % of this area

Sexton Creek Limestone at base in Kentland area and on cross-section

Sanders Group (Mississippian) at surface, covers 3 % of this area

Mostly skeletal limestone, cherty in lower part

Whitewater Formation (Ordovician) at surface, covers 3 % of this area

Skeletal limestone and calcareous shale; dolomitic mudstone (S, Saluda Member) at base

Dillsboro Formation (Ordovician) at surface, covers 2 % of this area

Skeletal limestone and calcareous shale

Blue River Group (Mississippian) at surface, covers 0.4 % of this area

Mostly micritic, skeletal, and oolitic limestone

West Baden Group (Mississippian) at surface, covers 0.1 % of this area

Shale, sandstone, and micritic and skeletal limestone