Usage:
Butler Sandstone Member of Allegheny Formation (MD*,PA*)
Butler Sandstone Member of Freeport Formation (PA)
Geologic age:
Middle Pennsylvanian*
Type section, locality, area and/or origin of name:
Type locality: town of Butler, Butler Co., PA, just below Mr. Muntz's, opposite mills of Waldo & Bros., where it has been quarried (White, 1878).
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 ([ ]).