Usage:
/Grass Valley Formation (UT)
[Preoccupied. Name previously applied to Grass Valley Formation by Muller and others (1951) in NV.]
Geologic age:
Tertiary
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by author, but probably named from exposures in Grass Valley, Washington Co., UT (Cook, 1957).
AAPG geologic province:
Great Basin province
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 ([ ]).