USGS Visual Identifier
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Geologic Unit: Allentown

Allentown Member of Kittatinny Limestone (NJ)
Allentown Limestone (PA)
Allentown Formation (PA,NJ)
Allentown Dolomite (NJ*,PA*)
Allentown Dolomite of Kittatinny Supergroup (NJ*,PA*)

Cambrian, Late*
Ordovician, Early(?)*
Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Named from exposures along Lehigh and Jordan Creeks in the vicinity of Allentown, PA (Wherry, 1909).

Allentown Dolomite divided into (ascending) Tuckerton*, Muhlenberg*, and Maiden Creek* Members in Lehigh and Berks Cos., PA. Allentown Formation divided into Limeport Member and unnamed upper member in NJ.

Unit Name History:
Named (Wherry, 1909).
Overview (Drake, 1965).
Revised to member of Kittatinny Formation (Miller, 1974).
Revised, divided into members (MacLachlan, 1979).
Overview in PA (Berg and others, 1980).
Revised to part of Kittatinny Supergroup; Age modified (Drake, and Lyttle, 1980).
Overview (Drake, 1987).
Overview (Dalton, 1989).
Overview in NJ (Monteverde, 1992).
Age modified (Repetski and others, 1995).

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