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National Geologic Map Database

Geologic Unit: Clarence

Usage:

Clarence Member of Onondaga Limestone (NY*)
Clarence Member of Onondaga Formation (PA)
Clarence Chert of Onondaga Group (PA)
Clarence facies (informal) in Edgecliff Member of Onondaga Limestone (NY)

For informal usage, the rank or lithologic term should not be capitalized.


Geologic age:

early Middle Devonian (Eifelian)


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

Type section: in and near village of Clarence (15 mi east of Buffalo) where member is well exposed, especially along NY Highway 5 just east of village center, Clarence 7.5-minute quadrangle, Erie Co., western NY (Ozol, 1964).


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 ([ ]).