Usage:
Pine Butte Member of Sundance Formation (CO*,SD*,WY*)
Geologic age:
late Middle Jurassic (Callovian)*
Type section, locality, area and/or origin of name:
Type section: in S/2 sec. 13, NW/4 sec. 14, T. 23 N., R. 79 W., Carbon Co., WY. Named from Pine Butte, Carbon Co., WY (Pipiringos, 1968).
AAPG geologic province:
Chadron arch*
Green 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 ([ ]).