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Geologic Unit: Drakes

Drakes Formation (KY*,OH*,IN*)
Drakes Formation of Cincinnati group (informal) (OH)
For informal usage, the rank or lithologic term should not be capitalized.

Ordovician, Late*
Geologic Province:
Cincinnati arch*

Areal Extent:

Type Locality:
Type section: Along dirt road from Preachersville to Cartersville, near East Fork of Drakes Creek, Paint Lick quadrangle, in southern Garrard Co., KY (Weir and others, 1965).

(alphabetical) --all in KY*: Bardstown Member, Preachersville Member, Rowland Member, Saluda Dolomite Member.

Unit Name History:
Named (Weir and others, 1965).
Extended into western side of Jessamine dome in KY (Peterson, 1966).
Bardstown Member named (Peterson, 1970).
Extended into OH (Weiss and others, 1972).
Rowland Member extended into IN (Swadley, 1979).
Overview (Weir and others, 1984).
Assigned to informal Cincinnati group (Shrake and others, 1988).
Overview (Wahlman, 1992).
Not used (Holland, 1993).
Overview; Age modified (Frey, 1995).

Note: If you need more information, please contact Nancy Stamm (
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Database project personnel
Last modified: 15-Jan-2013