Geologic units in Trimble county, Kentucky

Drakes Formation (Ordovician) at surface, covers 33 % of this area

Drakes Formation

Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided (Silurian) at surface, covers 22 % of this area

Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided

Bull Fork Formation (Ordovician) at surface, covers 18 % of this area

Bull Fork Formation

Bull Fork Formation and Grant Lake and Calloway Creek Limestones, undivided (Ordovician) at surface, covers 11 % of this area

Bull Fork Formation and Grant Lake and Calloway Creek Limestones, undivided; Along Ohio River in Oldham and Trimble Counties

Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided (Ordovician) at surface, covers 10 % of this area

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

Glacial deposits, undifferentiated (Pleistocene to Holocene) at surface, covers 4 % of this area

Glacial deposits, undifferentiated; shown locally

Alluvium (Pleistocene to Holocene) at surface, covers 1 % of this area

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

Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers 0.6 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

Dillsboro Formation (Ordovician) at surface, covers < 0.1 % of this area

Skeletal limestone and calcareous shale

Whitewater Formation (Ordovician) at surface, covers < 0.1 % of this area

Skeletal limestone and calcareous shale; dolomitic mudstone (S, Saluda Member) at base