Geologic units in Franklin county, Kentucky

Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided (Ordovician) at surface, covers 2 % of this area: Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided
Lithology: limestone; shale; siltstone
Alluvium (Pleistocene to Holocene) at surface, covers 10 % of this area: Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks
Lithology: sand; silt; glacial drift
High Bridge Group (Ordovician) at surface, covers 0.7 % of this area: High Bridge Group
Lithology: limestone; shale; dolostone (dolomite)
Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers 40 % of this area: Garrard Siltstone and Kope and Clays Ferry Formations, undivided
Lithology: shale; limestone; siltstone
Lexington Limestone (Ordovician) at surface, covers 48 % of this area: Lexington Limestone
Lithology: limestone; shale