USGS Visual Identifier
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Geologic Unit: Corryville

Corryville Formation (OH)
Corryville Member of Grant Lake Limestone (OH,KY)
Corryville Member of Grant Lake Formation (OH*)
Corryville Shale Member of McMillan Formation (OH*)

Ordovician, Late*
Geologic Province:
Cincinnati arch*

Areal Extent:

Type Locality:
Not designated. Named from Corryville, near Cincinnati, OH (Nickles, 1902).

Unit Name History:
Named (Nickles, 1902). Assigned to Maysville group (Patton and others, 1953) [From GNC index card files; not synopsized]. Restricted from IN (R.H. Shaver and others, 1970, Indiana Geol. Survey Bull., no. 43, 229 p.) [Not synopsized]. Revised (MacSwinford and Schumacher, 1985) [From GNC index card files; not synopsized]. Revised (Schumacher and others, 1991). Overview (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