USGS Visual Identifier
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Geologic Unit: Chambersburg

Chambersburg Formation (PA*)
Chambersburg Limestone (MD*,PA*,VA*,WV*)
Chambersburg Limestone of Trenton Group (WV)

Ordovician, Middle*

Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Exposures west of Chambersburg, Franklin Co., central southern PA (Stose, 1906).

Unit Name History:
Named (Stose, 1906).
Overview (Stose, 1909).
Revised (Ulrich, 1911).
Revised (Butts, 1940).
Revised (Craig, 1941).
Revised and restricted from VA (Cooper and Cooper, 1946).
Overview (Root, 1968).
Included in Trenton Group in WV (Cardwell and others, 1968).
Overview (Nutter, 1973).
Overview (Geyer and Wilshusen, 1982).
Biostratigraphic dating (Harris and others, 1994).

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