Geologic units in Pulaski county, Indiana

Wabash Formation (Silurian) at surface, covers 49 % of this area

Limestone, dolomite, and argillaceous dolomite

Muscatatuck Group (Devonian) at surface, covers 39 % of this area

Limestone and dolomite

Antrim Shale (Devonian) at surface, covers 12 % of this area

Black shale; gray shale and limestone in lower part