Geologic units in Robertson county, Kentucky

Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers 66 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

Lexington Limestone (Ordovician) at surface, covers 19 % of this area

Lexington Limestone

Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided (Ordovician) at surface, covers 15 % of this area

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