USGS Visual Identifier
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Geologic Unit: Grant Lake

Grant Lake Limestone (KY*,OH*)
Grant Lake Member of Ashlock Formation (KY*)
Grant Lake Formation (OH*)
Grant Lake Limestone 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: roadcuts along KY Highway 1129 about 4 mi north-northwest of Orangeburg, Mason Co., KY (Peck, 1966).

Tate Member (KY*). Bellevue Member (OH*,KY*). Corryville Member (OH*). Mount Auburn Member (OH*). Straight Creek Member (OH).

Unit Name History:
Named (Peck, 1966). Revised, reduced in rank (Simmons, 1967). Areal limits (Peterson, 1972) [From GNC index card files; not synopsized]. Informal members, assigned to informal Cincinnati group (Shrake and others, 1988). Revised; Redescribed; Principal reference (Schumacher and others, 1991). 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