Geologic units in Decatur county, Indiana

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers 57 % of this area

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

Muscatatuck Group (Devonian) at surface, covers 36 % of this area

Limestone and dolomite

Whitewater Formation (Ordovician) at surface, covers 7 % of this area

Skeletal limestone and calcareous shale; dolomitic mudstone (S, Saluda Member) at base

Dillsboro Formation (Ordovician) at surface, covers < 0.1 % of this area

Skeletal limestone and calcareous shale