Usage:
No current usage.
(†/Willow Spring Member of Chainman Formation (UT) replaced with Willow Gap Limestone Member of Chainman Formation. See Willow Gap.)
[Preoccupied. Name previously applied to Willow Spring Granodiorite of Ransome (1903) in AZ, and Willow Spring Member of Cove Mountain Formation of Cook (1960) in UT.]
Geologic age:
Mississippian
Type section, locality, area and/or origin of name:
Not stated. Occurs in Silver Island Range, western UT. Origin of name not stated authors (Arnold and Sadlick, 1962).
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 ([ ]).