Usage:
Red marker bed (informal) of Minnelusa Formation (SD,WY)
A stratigraphic marker bed. Informal. The rank or lithologic term should not be capitalized.
Geologic age:
Pennsylvanian
Permian, Early
Type section, locality, area and/or origin of name:
Not designated. Name applied to marker bed of red shale in upper part of Minnelusa Formation. In the Dewey Dome oil field, Weston Co., WY, is 470 ft below top of Minnelusa; in the Mule Creek oil field, Niobrara Co., WY, is 465 ft below top of Minnelusa; and in the Lance Creek oil field, Niobrara Co., WY, 440 ft below top of Minnelusa (Krampert, 1940).
AAPG geologic province:
Williston basin
Chadron arch
Denver basin
Powder 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 ([ ]).