USGS Visual Identifier
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Geologic Unit: Logana

Logana Member of Lexington Limestone (KY*,OH)

Ordovician, Middle*
Geologic Province:
Cincinnati arch*

Areal Extent:

Type Locality:
Logana Station (now abandoned) on the Louisville and Atlantic RR, Jessamine Co., KY (Miller, 1905).

Unit Name History:
[Only the Miller (1905), Cressman (1964), Shrake and others (1990), Wahlman (1992), and Frey (1995) references include synopses here. Foerste (1906), Foerste and Miller (1913), Huffman (1945), and Hamilton (1950) taken from US geologic names lexicons, USGS Bull. 896, 1200. McDowell and others (1981) is from the GNC index card files.]
Name proposed for the Logana bed of Lexington limestone (Miller, 1905).
Contacts revised (A.F. Foerste, 1906, Kentucky Geol. Survey Bull. 7).
Correlation information (A.F. Foerste and A.M. Miller, 1913, Kentucky Geol. Survey, 4th ser., v. 1, pt. 1).
Usage in KY (G.G. Huffman, 1945, Jour. Geology, v. 53, no. 3, p. 169; D.K. Hamilton, 1950, Kentucky Geol. Survey, ser. 9, Bull. 5, p. 12).
Rank reduced (Cressman, 1964).
KY State Geol. Map usage (R.C. McDowell and others, 1981, USGS Misc. Field Studies Map, MF-1291).
Usage 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