Usage:
Deep River Beds (MT*)
Deep River Formation (MT)
Geologic age:
Oligocene, early* to Miocene, middle*
Type section, locality, area and/or origin of name:
Deposits occur east of Fort Ellis along Deep Creek (also called Deep River and Smith River), Meagher Co., and in Little Belt Mountains region, central southern MT (Dall and Harris, 1892).
AAPG geologic province:
Montana folded belt*
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 ([ ]).