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National Geologic Map Database

Geologic Unit: Bull Ridge

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).