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National Geologic Map Database

Geologic Unit: Fisher Ridge

Usage:

Fisher Ridge Member of Mahantango Formation (PA)


Geologic age:

late Middle Devonian (Givetian)


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

Type section: first and second abandoned quarries, counting from south, and quarry access road, along east side of Pennsylvania Central Railroad, at west end of Fisher Ridge, 4 km south of Dalmetia, Northumberland Co., PA (Faill and others, 1978).


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 ([ ]).