USGS Visual Identifier
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Geologic Unit: Millersburg

Millersburg Member of Lexington Limestone (KY*)

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

Areal Extent:

Type Locality:
Vicinity of Millersburg, northeastern Bourbon Co., KY (Foerste, 1914). Reference section in roadcut on Athens-Boonesboro road, 0.4 mi northwest of interchange with I-75, Coletown quadrangle, Fayette Co., KY (Black and others, 1965).

Unit Name History:
Named Millersburg member of Cynthiana formation (Foerste, 1914). Revised to a division of Cynthiana formation (McFarlan and White, 1948) [From GNC index card files; not synopsized]. Used as a member of Cynthiana formation (Hamilton, 1950) [From GNC index card files; not synopsized]. Revised to Millersburg Member of Lexington Limestone; Principal reference section (Black and others, 1965). Contacts revised (Black and Cuppels, 1973). Age modified; Overview (Cressman, 1973). 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