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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).