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National Geologic Map Database

Geologic Unit: Trimmers Rock

Usage:

Trimmers Rock Formation of Susquehanna Group (PA*)
Trimmers Rock Formation (PA)
Trimmers Rock Sandstone of Susquehanna Group (PA*)
Trimmers Rock Member of Fort Littleton Formation of Susquehanna Group (PA)


Subunits:

Millrift and Sloat Brook Members (PA*)


Geologic age:

Late Devonian*


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

Not designated. Named from hill 1.5 mi east of Newport, Perry Co., south-central PA (Willard, 1935).


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 ([ ]).