Usage:
Sewickley Member of Pittsburgh Formation of Monongahela Group (PA*)
Geologic age:
Pennsylvanian, Late*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by author, but probably named from association with Sewickley coal bed, which is named from Sewickley Creek, Westmoreland Co., southwestern PA (White, 1891).
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 ([ ]).