USGS Visual Identifier
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Geologic Unit: Boyd Gap

Boyd Gap Formation of Great Smoky Group (TN*,NC*,GA*)

Proterozoic, Late*

Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Type section: roadcuts along U.S. Highway 64, from 22 to 30 km east of Parksville, Polk Co., TN (Wiener and Merschat, 1978).

Unit Name History:
Named (Wiener and Merschat, 1978).
Geographically extended (Gair and Slack, 1982).
NC State Geol. Map usage (Brown and others, 1985).

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