Geologic units in Bourbon county, Kentucky

Lexington Limestone (Ordovician) at surface, covers 90 % of this area

Lexington Limestone

Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers 10 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

Alluvium (Pleistocene to Holocene) at surface, covers 0.4 % 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 0.1 % of this area

Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided