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National Geologic Map Database

Geologic Unit: Evanston

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 ([ ]).