USGS Visual Identifier
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Geologic Unit: Benbolt

Benbolt Formation of Chickamauga Group (TN)
Benbolt Formation (TN, VA)
Benbolt Limestone (TN, VA*, WV*)

Ordovician, Middle*

Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Type section: about 1-1/8 miles south of Benbolt, west of Tazwell County Farm, VA (Cooper and Prouty, 1943).

Shannondale Limestone Member (VA), Burkes Garden Limestone Member (VA,TN).

Unit Name History:
Named (Cooper and Prouty, 1943).
Extended into TN (Prouty, 1946).
Revised to part of Chickamauga Group (Ruppel and Walker, 1984).
Extended into subsurface of WV; Revised (Ryder, 1992).

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