Usage:
Soap Creek Bentonite Bed of Frontier Formation (MT*,WY*)
Soap Creek Bentonite Bed of Belle Fourche Member of Cody Shale (MT*,WY*)
Soap Creek Bentonite Bed of Belle Fourche Member of Frontier Formation (WY*)
Geologic age:
early Late Cretaceous (Cenomanian)*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by authors (Richards and Rogers, 1951).
AAPG geologic province:
Powder River basin*
Wind River basin*
Central Montana uplift*
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 ([ ]).