Usage:
Dunbar Creek Formation of Bozeman Group (MT*)
Dunbar Creek Member of Renova Formation of Bozeman Group (MT*)
Geologic age:
Tertiary*
Oligocene, early*
Oligocene, middle
Orellan
Type section, locality, area and/or origin of name:
Type area: in E/2 sec. 7, T. 1 S., R. 2 E., Gallatin Co., MT (Robinson and Barnett, 1963).
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 ([ ]).