Usage:
Millrift Member of Trimmers Rock Formation (PA*)
Millrift Formation of Genesee Group (NY)
Millrift Formation (PA)
Geologic age:
Late Devonian*
Type section, locality, area and/or origin of name:
Type section: west bank of Delaware River at Millrift, from beneath Erie-Lackawanna RR bridge to 230 to 275 m downstream, Westfall Twp., Pike Co., PA (Fletcher and Woodrow, 1970).
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 ([ ]).