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National Geologic Map Database

Geologic Unit: Duncannon

Usage:

Duncannon Member of Catskill Formation (PA*)


Geologic age:

Late Devonian*


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

Type section: Peters Mountain section in southeast corner of Duncannon 15-min quadrangle in Middle Paxton Twp., Dauphin Co., southeastern PA, on east side of Susquehanna River where it cuts through Peters Mountain. Measurement made along base of cliff on east side of Pennsylvania Railroad tracks (Dyson, 1967).


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