Geologic units in Lawrence county, Indiana

Blue River Group (Mississippian) at surface, covers 34 % of this area

Mostly micritic, skeletal, and oolitic limestone

Sanders Group (Mississippian) at surface, covers 27 % of this area

Mostly skeletal limestone, cherty in lower part

Borden Group (Mississippian) at surface, covers 23 % of this area

Mostly siltstone; lenses of crinodial limestone in upper part. Much cherty and silty limestone and dolomite in northwest. NP, top of New Providence Shale

West Baden Group (Mississippian) at surface, covers 11 % of this area

Shale, sandstone, and micritic and skeletal limestone

Stephensport Group (Mississippian) at surface, covers 2 % of this area

Sandstone, micritic and skeletal limestone, and shale

Raccoon Creek Group (Pennsylvanian) at surface, covers 2 % of this area

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