Usage:
Grass Creek Member of Frontier Formation (UT)
Geologic age:
Late Cretaceous (Coniacian)
Type section, locality, area and/or origin of name:
Not designated. Named from exposures in lower drainage of Grass Creek Valley, near Echo Reservoir, Summit Co., UT (Hale, 1960).
AAPG geologic province:
Uinta 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 ([ ]).