Geologic units in Crawford county, Indiana

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

Sandstone, micritic and skeletal limestone, and shale

West Baden Group (Mississippian) at surface, covers 22 % of this area

Shale, sandstone, and micritic and skeletal limestone

Buffalo Wallow Group (Mississippian) at surface, covers 17 % of this area

Mostly shale and sandstone; also includes thin beds of micritic limestone. L, Leopold Limestone member

Blue River Group (Mississippian) at surface, covers 15 % of this area

Mostly micritic, skeletal, and oolitic limestone

Raccoon Creek Group (Pennsylvanian) at surface, covers 12 % 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

Alluvium (Pleistocene to Holocene) at surface, covers < 0.1 % of this area

Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks

Ste. Genevieve and St. Louis Limestones, undivided (Mississippian) at surface, covers < 0.1 % of this area

Ste. Genevieve and St. Louis Limestones, undivided; includes Salem Limestone west of Christian County

Rocks of Chesterian age, lower part (Upper Mississippian) at surface, covers < 0.1 % of this area

Rocks of Chesterian age, lower part

Glacial deposits, undifferentiated (Pleistocene to Holocene) at surface, covers < 0.1 % of this area

Glacial deposits, undifferentiated; shown locally