Usage:
Annville Limestone (PA*)
Annville Formation (PA*)
Annville Formation of St. Paul Group (PA)
Geologic age:
Middle to Late Ordovician (Whiterockian; Chazyan)*
Type section, locality, area and/or origin of name:
Type section: quarry at old Palmyra plant of H.E. Millard Limestone Company about 1.5 mi northwest of Palmyra, southeast PA (Prouty, 1959).
Named from town of Annville, Lebanon Co. (Miller, 1925).
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 ([ ]).