Usage:
Evanston Formation (ID*,UT*,WY*)
Subunits:
Hams Fork Conglomerate Member (WY*) or Hams Fork Member (UT*).
Geologic age:
Late Cretaceous to early Tertiary (Campanian to Paleocene)*
Type section, locality, area and/or origin of name:
Well exposed from Evanston for 10 mi north, [Uinta Co.], southwestern WY (Veatch, 1906, 1907).
AAPG geologic province:
Green River basin*
Wasatch uplift*
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 ([ ]).