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National Geologic Map Database

Geologic Unit: Tioga

Usage:

Tioga Ash Bed (NY*,OH*,PA*,WV*)
Tioga Bentonite Bed of Grand Tower Limestone (IL)
Tioga Bentonite Bed of Jeffersonville Limestone (IN)
Tioga Bentonite Bed of Cranberry Marsh Member of Detroit River Formation (IN)
Tioga Bentonite Bed of Grover Ditch Member of Detroit River Formation (IN)
Tioga Bentonite Bed of Vernon Fork Member of Jeffersonville Limestone (IN)
Tioga Bentonite Bed of Onondaga Limestone (MD,PA,VA)
Tioga Bentonite Bed of Columbus Limestone (OH)
Tioga Bentonite Bed of Onondaga Member of Romney Shale (WV)


Geologic age:

early Middle Devonian (Eifelian)*


Type section, locality, area and/or origin of name:

Named from Tioga gas field, Tioga Co., PA. First recognized there in drill cuttings.


AAPG geologic province:

Appalachian basin*
Cincinnati arch
Illinois 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 ([ ]).