USGS Visual Identifier
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Geologic Unit: Ocoee

Ocoee Supergroup (GA*,NC*,TN*)

Proterozoic, Late*
Cambrian, Early
Geologic Province:
Appalachian basin*
Piedmont-Blue Ridge province*

Areal Extent:

Type Locality:
Exposures along the narrows of Ocoee River, Polk Co., TN (Safford, 1856).

Coweeta Group (NC), Snowbird Group (GA*,NC*,TN*), Great Smoky Group (GA*,NC*,TN*), Walden Creek Group (GA*,NC*,TN*), Pine Mountain Group (GA*)

Unit Name History:
Named Ocoee group (Safford, 1856).
Revised to Ocoee series (Stose and Stose, 1944).
Revised (Hamilton, 1961).
TN State Geol. Map usage (Hardeman and others, 1966).
Redefined as Ocoee Supergroup (Higgins and Zietz, 1975).
NC State Geol. Map usage; Revised (Brown and others, 1985).
Revised; Age modified (Higgins and others, 1988).
Controversial age assignment; Biostratigraphic dating (Unrug and Unrug, 1990).
Age discussed; Overview (Rodgers, 1991).
Biostratigraphic dating (Unrug and others, 1991).
Areally restricted (Rankin and others, 1993).
Overview (Reed, 1993).
Correlations (Carter and others, 1995).
Pinelog Formation removed (Crawford and others, 1999).
[When referring to the Ocoee series of Stose and Stose (1944), please use informally. The practice of employing "series" for lithostratigraphic or lithodemic nomenclature is now regarded as improper (see ACSN, 1961, 1970; NACSN, 1983). The term "Series" is applied formally only to chronostratigraphic units.]

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