Usage:
Monongahela Formation (MD*,OH*,PA*,WV*)
Monongahela Group (PA*,OH,WV*)
Subunits:
GROUP STATUS: Uniontown Formation (PA*,WV), Benwood Limestone (OH), Sewickley Sandstone (PA), and Pittsburgh Formation (PA*).
FORMATION STATUS: Big Run Sandstone [Bed] (OH), Gilboy Sandstone Member (OH*,PA*,WV*), Little Captina Limestone Member (OH*), McKeefrey Siltstone Member (OH*,PA*,WV*), Morning View Sandstone Member (OH*,PA*,WV*), Redstone Member (WV*), Ritchie Red Beds (OH,WV).
Geologic age:
Pennsylvanian, Late*
Type section, locality, area and/or origin of name:
Type area: Exposures along Monongahela River, southwest PA (Rogers, 1840).
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 ([ ]).