USGS Visual Identifier
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Geologic Unit: Cocalico

Cocalico Shale (PA*)
Cocalico Formation (PA)

Cambrian, Late
Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Exposures along Cocalico Creek (Stose and Jonas, 1922).

Unit Name History:
Named (Stose and Jonas, 1922). Is local usage (Stose and Jonas, 1927). Areal limits (Swartz, 1948). Redescribed as Cocalico Formation (Meisler and Becher, 1971). Overview (McGlade and others, 1972). Overview (Berg and others, 1980). Age modified (Berg and others, 1986).

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
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Last modified: 15-Jan-2013