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National Geologic Map Database

Geologic Unit: Grant Lake

Usage:

Grant Lake Limestone (KY*,OH*)
Grant Lake Formation (OH*)
Grant Lake Formation of Cincinnati group (informal) (OH)
Grant Lake Limestone of Cincinnati group (informal) (OH)
Grant Lake Member of Ashlock Formation (KY*)

(informal Cincinnati group is the usage of the OH Geol. Survey. The rank or lithologic term should not be capitalized.)


Subunits:

FORMATION STATUS (alphabetical): Bellevue Member (KY,OH*) or Bellevue Limestone Member (OH*) or Bellevue Tongue (IN,KY*,OH), Corryville Member (KY,OH*) or Corryville Shale Member (OH*), Mount Auburn Member (OH*), Straight Creek Member (OH,KY), Tate Member (KY*).


Geologic age:

Late Ordovician (Cincinnatian; Maysvillian)*


Type section, locality, area and/or origin of name:

Type section: roadcuts along KY Highway 1129 about 4 mi north-northwest of Orangeburg, Mason Co., KY (Peck, 1966).


AAPG geologic province:

Cincinnati arch*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).