Usage:
Shippensburg Formation (MD,PA)
Subunits:
Pinesburg (PA,MD), Fannettsburg (PA,MD), Doylesburg (PA) Members
Geologic age:
Late Ordovician (Mohawkian; Turinian)
Type section, locality, area and/or origin of name:
Along Cumberland Valley, 2.1 miles southwest of Marion, Franklin Co., PA. Named from exposure at Middle Spring, 2.5 miles northwest of Shippensburg, 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 ([ ]).