Geologic units in Shelby county, Kentucky

Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided (Ordovician) at surface, covers 57 % 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 27 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

Drakes Formation (Ordovician) at surface, covers 11 % of this area

Drakes Formation

Bull Fork Formation (Ordovician) at surface, covers 4 % of this area

Bull Fork Formation

Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided (Silurian) at surface, covers 0.8 % of this area

Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided

Lexington Limestone (Ordovician) at surface, covers 0.3 % of this area

Lexington Limestone