USGS Visual Identifier
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Geologic Unit: Lexington

Usage:
Lexington Limestone (KY*,IN*,OH*)
Lexington Formation (OH)

Age:
Ordovician, Middle*
Champlainian*
Kirkfieldian*
Shermanian*
Ordovician, Late*
Cincinnatian*
Edenian*
Geologic Province:
Cincinnati arch*






Areal Extent:
KY*
IN*
OH*





Type Locality:
Type area: Lexington, Fayette Co., central KY (Campbell, 1898).

Subunits:
Curdsville Limestone Member (IN,KY*,OH). Logana Member (KY*,OH). Grier Limestone Member (KY*). Perryville Limestone Member (KY*). Brannon Member (KY*). Sulphur Well Member (KY*). Stamping Ground Member (KY*). Tanglewood Limestone Member (KY*). Devils Hollow Member (KY*). Millersburg Member (KY*). Strodes Creek Member (KY*). Greendale Lentil (KY*).

Unit Name History:
Named (Campbell, 1898).
Revised (Black and others, 1965).
Extended Curdsville and Logana Members to OH (Shrake and others, 1990).
Informal bentonite beds named (Schumacher and Carlton, 1991).
Overview (Wahlman, 1992).
Overview; Age modified (Frey, 1995).
Overview (Ryder and others, 1996).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
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
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013