USGS Visual Identifier
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Geologic Unit: Mount Auburn

Mount Auburn Formation (OH)
Mount Auburn Member of Grant Lake Formation (OH*)
Mount Auburn Shale Member of McMillan Formation (OH*)

Ordovician, Late*
Geologic Province:
Cincinnati arch*

Areal Extent:

Type Locality:
Not designated. Named from Mount Auburn, Cincinnati, OH (Nickles, 1902).

Unit Name History:
Named (Nickles, 1902).
Assigned to McMillan group (McFarlan, 1943).
Restricted from IN (Shaver and others, 1970).
Assigned to Grant Lake Limestone (MacSwinford and Schumacher, 1985).
Revised (Tobin, 1986; Schumacher and others, 1989, 1991).
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