Geologic Unit: Antietam
Antietam Formation of Chilhowee Group (VA*,MD,PA,WV)
Antietam Quartzite of Chilhowee Group (MD*,PA*,VA*,WV*)
Antietam Schist of Chilhowee Group (MD*,PA*)
Antietam Sandstone of Chilhowee Group (MD*,PA*,VA*)
Exposures near Antietam Creek, north of Potomac River, Washington Co., western MD (Keith, 1893).
Unit Name History:
Named Antietam Sandstone (Keith, 1893).
Overview as Antietam Quartzite (Stose and Stose, 1946).
Described in WV (Woodward, 1949).
Described in VA; Revised (King, 1950).
Described in PA (Chapman, 1950).
Areal limits (Cloos, 1951).
Areal limits; Overview (Scotford, 1951).
PA Geol. Survey usage (Gray and others, 1960).
Age modified (Hack, 1982).
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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