Usage:
No current usage.
(Rocks of †Sentinel Hill Member of Schrader Bluff Formation of †Colville Group (AK*) reallocated to Schrader Bluff Formation. See Schrader Bluff.)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Bluffs along northwest side of Colville River, from 5 to 15 mi northeast of Umiat Mountain, northern AK (Whittington, 1956).
AAPG geologic province:
Alaska Northern region*
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 ([ ]).