Usage:
Midnight Peak Formation (WA*)
Midnight Peak Formation of Pasayten Group (WA)
Subunits:
Ventura Member (WA).
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Probably named from Midnight Peak [name changed to Midnight Mountain in 1960's], 15 mi west-northwest of Twisp, 2.5 mi northeast of Twisp River (Barksdale, 1948).
Type section: south limb of syncline between Twisp River and its tributary, Canyon Creek, in T. 34 N., R. 20 E., Midnight Peak 7.5-min quadrangle, Okanogan Co., WA (Barksdale, 1975).
AAPG geologic province:
Northern Cascade Range-Okanagan province
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 ([ ]).