Usage:
Mercersburg Formation (PA)
Subunits:
Housum and Kauffman Members (PA)
Geologic age:
Late Ordovician (Mohawkian; Turinian)
Type section, locality, area and/or origin of name:
Along Cumberland Valley Railroad, 2 miles southwest of Marion, Franklin Co. Named from exposure along West Branch of Conococheague Creek, 2.5 miles southeast of Mercersburg, Franklin Co., PA (Craig, 1949).
AAPG geologic province:
Appalachian basin
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).