Usage:
Marcellus Formation (WV)
Marcellus Formation of Hamilton Group (NY,PA*)
Marcellus Member of Millboro Shale (VA)
Marcellus Shale (KY*,NJ*,OH*,TN*,VA*,WV*)
Marcellus Shale of Hamilton Group (MD*,NY*,OH*,PA*,TN*,VA*,WV*)
Marcellus Shale Member of Romney Formation (MD)
Subunits:
(alphabetical): Berne (NY), Bridgewater (NY), Brodhead Creek (PA*), Cardiff (NY,PA), Cherry Valley (PA*,NY*,WV*), Chittenango (NY), Mahanoy (PA), Mottville (NY), Napanoch (NY), Oatka Creek (NY) Otsego (NY), Pecksport (NY), Purcell (MD,PA,WV), Solsville (NY), Stony Hollow (NY*,NJ,PA*), Turkey Ridge (PA), Union Springs (NY*,PA*) Members
Geologic age:
early Middle Devonian (Eifelian)*
Type section, locality, area and/or origin of name:
Type section: Slate Hill, about 1 mi south of Marcellus. Complete section exposed in Jackknife ravine on northeast slope of hill. Named from exposures at village of Marcellus, Onondaga Co., central NY (Cooper 1936).
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 ([ ]).