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Geologic units in Owen county, Indiana

Sanders Group (Mississippian) at surface, covers 68 % of this area

Sanders Group - Mostly skeletal limestone, cherty in lower part

Lithology: limestone; chert

West Baden Group (Mississippian) at surface, covers 18 % of this area

West Baden Group - Shale, sandstone, and micritic and skeletal limestone

Lithology: sandstone; shale; limestone

Stephensport Group (Mississippian) at surface, covers 9 % of this area

Stephensport Group - Sandstone, micritic and skeletal limestone, and shale

Lithology: limestone; sandstone; shale

Raccoon Creek Group (Pennsylvanian) at surface, covers 4 % of this area

Raccoon Creek Group - Mostly shale and sandstone; also includes thin beds of limestone, clay, and coal. B, Buffaloville Coal Member; LB, Lower Block Coal Member

Blue River Group (Mississippian) at surface, covers 0.2 % of this area

Blue River Group - Mostly micritic, skeletal, and oolitic limestone

Lithology: limestone