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National Geologic Map Database

Geologic Unit: Marcellus

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).