Geologic units in Madison 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

Drakes Formation (Ordovician) at surface, covers 20 % of this area

Drakes Formation

Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers 16 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

New Albany, Chattanooga, and Ohio Shales, Boyle Dolomite (Limestone), and Sellersburg Limestone, undivided (Devonian to Mississippian) at surface, covers 12 % of this area

New Albany, Chattanooga, and Ohio Shales, Boyle Dolomite (Limestone), and Sellersburg Limestone, undivided

Crab Orchard Formation and Brassfield Dolomite, undivided (Silurian) at surface, covers 10 % of this area

Crab Orchard Formation and Brassfield Dolomite, undivided; locally includes Bisher Dolomite in Estill County

Wildie, Nada, Halls Gap, Holtsclaw Siltstone, Cowbell, Nancy, Kenwood Siltstone, New Providence Shale, Sunbury Shale, Berea Sandstone, and Bedford Shale, undivided; Borden Formation locally includes Renfro Member in eastern Kentucky (Devonian to Mississippian) at surface, covers 5 % of this area

Wildie, Nada, Halls Gap, Holtsclaw Siltstone, Cowbell, Nancy, Kenwood Siltstone, New Providence Shale, Sunbury Shale, Berea Sandstone, and Bedford Shale, undivided; Borden Formation locally includes Renfro Member in eastern Kentucky

Lexington Limestone (Ordovician) at surface, covers 3 % of this area

Lexington Limestone

Pennington Formation and Newman Limestone (Mississippian) at surface, covers 1.0 % of this area

Pennington Formation and Newman Limestone; includes Carter Caves Sandstone in Carter County and vicinity

Breathitt Formation, lower part (Pennsylvanian) at surface, covers 0.5 % of this area

lower part which includes Livingston Conglomerate Member of Lee Formation in eastern Rockcastle County

High Bridge Group (Ordovician) at surface, covers 0.4 % of this area

High Bridge Group

Renfro and Muldraugh Members of Borden Formation and Fort Payne Formation, undivided (Mississippian) at surface, covers 0.1 % of this area

Renfro and Muldraugh Members of Borden Formation and Fort Payne Formation, undivided