Geologic units in Tippecanoe county, Indiana

New Albany Shale (Devonian-Mississippian) at surface, covers 53 % of this area

Black and greenish-gray shale

Borden Group (Mississippian) at surface, covers 39 % 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

Muscatatuck Group (Devonian) at surface, covers 7 % of this area

Limestone and dolomite

Wabash Formation (Silurian) at surface, covers 0.4 % of this area

Limestone, dolomite, and argillaceous dolomite