Usage:
Coburn Formation (PA*)
Coburn Formation of Trenton Group (PA*-subsurface)
Subunits:
(alphabetical) --all in PA: Coleville Member, Milesburg Member.
Geologic age:
Late Ordovician (Mohawkian; Chatfieldian; Kirkfieldian to Shermanian)*
Type section, locality, area and/or origin of name:
Named from town of Coburn, Center Co., PA (Field, 1919).
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 ([ ]).