Usage:
Mosby Sandstone Member of Belle Fourche Shale (MT*)
Mosby Sandstone Member of Colorado Shale (MT*)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Not designated. Named from Mosby Post Office, Garfield Co., MT (Lupton and Lee, 1921).
Type section: east of Musselshell River, from 0.25 mi east to 0.5 mi north of Mosby Post Office, in S/2 sec. 2 and N/2 sec. 11, T. 14 N., R. 30 E., Garfield Co., MT (Cobban, 1953).
AAPG geologic province:
Williston 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 ([ ]).