USGS Visual Identifier
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Geologic Unit: Curdsville

Curdsville Limestone of Trenton Group (KY)
Curdsville Limestone Member of Hermitage Formation (TN*)
Curdsville Limestone Member of Lexington Limestone (KY*,IN,OH)

Ordovician, Middle*
Ordovician, Late
Geologic Province:
Cincinnati arch*

Areal Extent:

Type Locality:
Named from Curdsville Station, Mercer Co., central KY (Miller, 1905).

Unit Name History:
Named Curdsville Bed of the Lexington Limestone (Miller, 1905).
Revised to Curdsville Limestone of Lexington Group (Hamilton, 1948).
Rank changed to Curdsville Member of Lexington Limestone [adopted by USGS] (Cressman, 1964).
Extended into IN; Age modified (Shaver and others, 1986) [From GNC index card files; not synopsized].
Used in OH (Shrake and others, 1990).
Overview (Wahlman, 1992).
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