Geologic units in Franklin county, Kentucky

Lexington Limestone (Ordovician) at surface, covers 48 % of this area

Lexington Limestone

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

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

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

High Bridge Group (Ordovician) at surface, covers 0.7 % of this area

High Bridge Group