Usage:
Okpikruak Formation (AK*)
Geologic age:
Early Cretaceous*; locally Late Jurassic*
Type section, locality, area and/or origin of name:
Type section: on east side of Okpikruak River, Lat. 64 deg. 35 min. N., Long. 153 deg. 38 min. W., northern AK (Gryc and others, 1951; Patton and Tailleur, 1964).
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 ([ ]).