Geologic units in Henry county, Kentucky

Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided (Ordovician) at surface, covers 31 % of this area

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

Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers 23 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

Bull Fork Formation (Ordovician) at surface, covers 22 % of this area

Bull Fork Formation

Drakes Formation (Ordovician) at surface, covers 13 % of this area

Drakes Formation

Alluvium (Pleistocene to Holocene) at surface, covers 6 % of this area

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

Lexington Limestone (Ordovician) at surface, covers 5 % of this area

Lexington Limestone

Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided (Silurian) at surface, covers 0.3 % of this area

Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided