Geologic units in Fulton county, Indiana

Wabash Formation (Silurian) at surface, covers 66 % of this area

Limestone, dolomite, and argillaceous dolomite

Muscatatuck Group (Devonian) at surface, covers 30 % of this area

Limestone and dolomite

Antrim Shale (Devonian) at surface, covers 4 % of this area

Black shale; gray shale and limestone in lower part