USGS Visual Identifier
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Geologic Unit: Liberty Hall

Liberty Hall Formation (VA*)
Liberty Hall Member of Edinburg Formation (VA)

Ordovician, Middle*
Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Type area: Exposures on east side of Massanutten syncline in vicinity of Lexington and Natural Bridge, VA. Named from old historic ruin constructed on and of this rock (Campbell, 1905).

Unit Name History:
Named (Campbell, 1905). Revised (Cooper and Cooper, 1946). Revised (Cooper, 1960). Revised (Kozak, 1970). Overview (Young and Rader, 1974). Revised (Rader and Biggs, 1976). Overview (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