Usage:
Beecher Island Member of Pierre Shale (CO*,KS*)
Beecher Island Shale Member of Pierre Shale of Montana Group (KS)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Named from exposures at Beecher Island, Yuma Co., northeastern CO (Elias, 1931).
AAPG geologic province:
Denver basin*
Las Animas arch*
Chadron arch*
Anadarko 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 ([ ]).