Geologic units in Hancock county, Indiana

Muscatatuck Group (Devonian) at surface, covers 87 % of this area

Limestone and dolomite

Wabash Formation (Silurian) at surface, covers 12 % of this area

Limestone, dolomite, and argillaceous dolomite

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

Dolomite, limestone, and argillaceous dolomite