Geologic units in Hamilton county, Indiana

Wabash Formation (Silurian) at surface, covers 84 % of this area

Limestone, dolomite, and argillaceous dolomite

Muscatatuck Group (Devonian) at surface, covers 11 % of this area

Limestone and dolomite

Pleasant Mills Formation (Silurian) at surface, covers 5 % of this area

Dolomite, limestone, and argillaceous dolomite

New Albany Shale (Devonian-Mississippian) at surface, covers 0.4 % of this area

Black and greenish-gray shale

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers < 0.1 % of this area

Sexton Creek Limestone at base in Kentland area and on cross-section