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National Geologic Map Database

Geologic Unit: Thunderhead

Usage:

Thunderhead Sandstone of Great Smoky Group of Ocoee Supergroup (NC*,TN*)
Thunderhead Formation of Great Smoky Group of Ocoee Supergroup (NC)


Geologic age:

Late Proterozoic*


Type section, locality, area and/or origin of name:

Named from development on Thunder Head [Thunderhead Mountain], western Great Smoky Mountains, Blount Co., eastern TN, and Swain Co., western NC (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Appalachian basin*
Piedmont-Blue Ridge province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).