Usage:
/Hepburn's Mesa Formation (MT)
[Preoccupied. Name previously applied to Hepburns Mesa Basalt by Ward and Wier (1962) in same area.]
Geologic age:
Tertiary
Miocene, middle
Type section, locality, area and/or origin of name:
Type section: in NE/4 SE/4 sec. 23, T. 6 S., R. 7 E., Lat. 45 deg. 18 min. N., Long. 110 deg. 49 min. W., Park Co., MT. Named from exposures at Hepburn's Mesa, Park Co., MT (Barnosky and Labar, 1989).
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 ([ ]).