Usage:
Bull Ridge Member of Mission Canyon Limestone of Madison Group (MT*)
Bull Ridge Member of Madison Limestone (MT*,WY*)
Geologic age:
Middle Mississippian (Visean; late Osagean to early Meramecian)*
Type section, locality, area and/or origin of name:
Type section: in valley of Bull Lake Creek, in SE/4 NW/4 NE/4 sec. 11, T. 2 N., R. 4 W., [Bull Lake West 7.5-min quadrangle], Fremont Co., west-central WY. Named from Bull Ridge, on south side of Bull Lake, [Bull Lake West 7.5-min quadrangle, Fremont Co., west-central WY] (Sando, 1968).
AAPG geologic province:
Wind River basin*
Yellowstone province*
Bighorn 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 ([ ]).