Geologic units in Whitley county, Indiana

Muscatatuck Group (Devonian) at surface, covers 70 % of this area

Limestone and dolomite

Antrim Shale (Devonian) at surface, covers 21 % of this area

Black shale; gray shale and limestone in lower part

Wabash Formation (Silurian) at surface, covers 10 % of this area

Limestone, dolomite, and argillaceous dolomite