Geologic units in Miami county, Indiana

Wabash Formation (Silurian) at surface, covers 98 % of this area

Limestone, dolomite, and argillaceous dolomite

Pleasant Mills Formation (Silurian) at surface, covers 2 % of this area

Dolomite, limestone, and argillaceous dolomite

Muscatatuck Group (Devonian) at surface, covers 0.3 % of this area

Limestone and dolomite