Geologic units in Ohio county, Kentucky

Tradewater Formation (Middle Pennsylvanian) at surface, covers 35 % of this area: Tradewater Formation
Lithology: siltstone; sandstone; limestone; coal
Caseyville Formation (Lower to Middle Pennsylvanian) at surface, covers 16 % of this area: Caseyville Formation
Lithology: siltstone; sandstone; conglomerate; shale; coal
Alluvium (Pleistocene to Holocene) at surface, covers 21 % of this area: Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks
Lithology: sand; silt; glacial drift
Sturgis Formation (Middle to Upper Pennsylvanian) at surface, covers 11 % of this area: Sturgis Formation
Lithology: siltstone; sandstone; shale; limestone; coal
Rocks of Chesterian age, lower part (Upper Mississippian) at surface, covers 0.9 % of this area: Rocks of Chesterian age, lower part
Lithology: limestone; sandstone; siltstone; shale
Carbondale Formation (Middle Pennsylvanian) at surface, covers 11 % of this area: Carbondale Formation
Lithology: siltstone; sandstone; shale; coal
Rocks of Chesterian age, upper part (Upper Mississippian) at surface, covers 4 % of this area: Rocks of Chesterian age, upper part
Lithology: shale; limestone; siltstone; sandstone; chert