USGS Visual Identifier
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Geologic Unit: Antes

Antes Shale (MD*)
Antes Shale of Trenton Group (WV*,PA)
Antes Formation (PA*)

Ordovician, Middle*
Ordovician, Late*
Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Type section: East bank of Antes Creek in immediate vicinity of U.S. Route 41, PA Route 880 intersection, NW part, Nippenose Valley.

Unit Name History:
Named (Kay, 1944).
Areal limits (Wagner, 1966).
Age modified (Sweet and Bergstrom, 1976).
Overview (Faill and others, 1977; Faill and others, 1989).
Areal limits; Age modified (Ryder, 1992).
Age modified (Ryder and others, 1992).
Overview (Pohn and others, in press).

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