USGS Visual Identifier
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Geologic Unit: Shenango

Shenango Formation (PA*,OH*)
Shenango Formation of Pocono Group (PA,OH)

Mississippian, Early*

Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Exposures on Shenango River, Mercer Co., PA (White, 1880; 1881).

Unit Name History:
Shenango first used as series (Platt, 1875).
Name applied to various units (White, 1880; 1881).
Revised (Caster, 1934).
Not used (Leggette, 1936).
Revised and assigned to Pocono group (Gray and others, 1960).
Overview (Kimmel and Schiner, 1970).
Overview (Dodge, 1992).
[When referring to the Shenango series of Platt (1875), please use informally. The practice of employing "series" for lithostratigraphic or lithodemic nomenclature is now regarded as improper (see ACSN, 1961, 1970; NACSN, 1983). The term "Series" is applied formally only to chronostratigraphic units.]

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