Usage:
Middle Canyon Formation (ID*)
Middle Canyon Formation of White Knob Group (ID,MT)
Middle Canyon Formation of Tendoy Group (MT*)
Geologic age:
Early to Middle Mississippian (Tournaisian to Visean; Kinderhookian to Meramecian)*
Type section, locality, area and/or origin of name:
Type section: near mouth of Middle Canyon, southern Lemhi Range, Butte Co., ID. Named from Middle Canyon (Huh, 1967).
Reference section: along crest of ridge, in N/2 SW/4 sec. 24, T. 9 N., R. 26 E., Butte Co., ID (Mamet and others, 1971).
AAPG geologic province:
Montana folded belt*
Snake River 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 ([ ]).