Usage:
No current usage.
(†Umiat Formation (AK) replaced with Topagoruk Formation. See Topagoruk.)
Geologic age:
late Early to early Late Cretaceous (Albian to Cenomanian)
Type section, locality, area and/or origin of name:
Named from section below 750 feet in Umiat Test Well No.1, in vicinity of Umiat, Colville River region, northern AK (Gryc and others, 1951).
AAPG geologic province:
Alaska Northern region
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 ([ ]).