USGS Visual Identifier
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Geologic Unit: Conestoga

Conestoga Formation (PA)
Conestoga Limestone (PA*)

Cambrian, Middle(?)*
Cambrian, Late*
Ordovician, Early(?)*
Geologic Province:
Piedmont-Blue Ridge province*

Areal Extent:

Type Locality:
Outcrops along Conestoga Creek, south of Lancaster, Lancaster Co., PA (Knopf and Jonas, 1923).

West York, Kreutz Creek, and Wrightsville members (of Gohn, 1976, Ph.D. dissertation).

Unit Name History:
First used (Stose and Jonas 1922).
Named (Knopf and Jonas, 1923).
Areal limits (Stose and Jonas, 1927).
Biostratigraphic dating (Jonas and Stose, 1936).
Age modified (Miller, 1937; Meisler and Becher, 1968; Gohn, 1978).
Overview (Berg and others, 1980; Taylor and Durika, 1990).

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