Usage:
Red Bird Silty Member of Pierre Shale (MT*,SD*,WY*)
Geologic age:
Late Cretaceous (Campanian)*
Type section, locality, area and/or origin of name:
Type section: in NW/4 SW/4 sec. 13 and NE/4 SE/4 sec. 14, T. 38 N., R. 62 W., Niobrara Co., WY. Named from Red Bird store, in NE/4 sec. 27, T. 38 N., R. 62 W., Nibrara Co., WY (Gill and Cobban, 1962).
Reference locality (for Pierre): near Red Bird, in secs. 14 and 23, T. 38 N., R. 62 W., Niobrara Co., WY (Gill and Cobban, 1966).
AAPG geologic province:
Williston 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 ([ ]).