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Geologic Unit: Great Smoky

Great Smoky Group of Ocoee Supergroup (NC*,TN*,GA*)

Proterozoic, Late*

Geologic Province:
Piedmont-Blue Ridge province*
Appalachian basin*

Areal Extent:

Type Locality:
Not designated. Named from extensive development in the Great Smoky Mountains, southwest of the Pigeon River, southern Knoxville quadrangle, NC (Keith, 1907).

(alphabetical): Ammons Formation (NC), Anakeesta Formation (NC*,TN*), Boyd Gap Formation (GA*,NC*,TN*), Buck Bald formation [informal] (TN*), Copperhill Formation (GA*,NC*,TN*), Dean Formation (GA*,NC*,TN*), Elkmont Sandstone (NC*,TN*), Etowah Formation (GA), Farner formation [informal] (TN*), Grassy Branch Formation (NC), Hothouse Formation (GA*,NC*,TN*), Hughes Gap Formation (GA*,NC*,TN*), Panther Bluff Formation (GA*,TN*), Rich Butt Formation (NC), Richard Russell Gneiss (GA*), Sweetwater Creek Formation (GA), Thunderhead Sandstone (NC*,TN*), Wehutty Formation (GA*,NC*,TN*).

Unit Name History:
[Please note: only the Keith (1907) and post-1960 references (except for Gair and Stack, 1982) include synopses here. The remaining references have yet to be added from US geologic names lexicon, USGS Bull. 1200 (p. 1593-1594), and GNC index card files.]
Named Great Smoky Conglomerate (Keith, 1907).
Revised (G.W. Crickmay, 1936, GSA Bull., v. 47, no. 9, p. 1381).
Areal limits (G.W. Stose [abs.], 1949, GSA Bull., v. 57, no. 12, pt. 2, p. 1233; 1949, GSA Bull., v. 60, no. 2, p. 278-282).
Revised (P.B. King, 1949, Amer. Jour. Sci., v. 247, no. 9, p. 631 (tbl. 4), 639).
Great Smoky Formation of Talladega series believed to be Precambrian (G.W. Crickmay, 1952, Georgia Geol. Survey Bull., no. 58, p. 27, 28).
Great Smoky Conglomerate extended into TN (John Rodgers, 1953, Tennessee Div. Geol. Bull., no. 58, pt. 2, p. 26 (tbl. 2), 31-32, pt. 1, pls.).
Revised (V.J. Hurst, 1955, Georgia Geol. Survey Bull., no. 55, p. 7, 8-45, pl. 1, geol. map).
Revised (P.B. King and others, 1958, GSA Bull., v. 69, no. 8, p. 955 (tbl. 1), 957-960).
Areal limits (J.L. Stuckey and S.G. Conrad, 1958, North Carolina Div. Mineral Res. Bull., no. 71, p. 35, 36).
NC State Geol. Map (J.L. Stuckey and others, 1958, Geologic Map of North Carolina, scale 1:500,000).
TN State Geol. Map (Hardeman and others, 1966).
Areal limits; Overview (Hadley and Nelson, 1971).
Correlation overview (Mohr, 1973).
Revised (Wiener and Merschat, 1978).
Revised (Gair and Slack, 1982) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given].
NC State Geol. Map usage (Brown and others, 1985).
Revised (Higgins and others, 1988; Merschat and Weiner, 1988).
Age discussed (Unrug and others, 1991).
Areally restricted (Rankin and others, 1993).
Revised (Crawford and others, 1999).

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
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Last modified: 15-Jan-2013