Usage:
No current usage.
(†Kushtaka Formation (AK) replaced with Kulthieth Formation. See Kulthieth.)
Geologic age:
Tertiary
Eocene
Oligocene(?)
Type section, locality, area and/or origin of name:
Not synopsized to date. Named from exposures in valley of Bering River and on shores of Lake Kushtaka, Controller Bay region, southern AK (Martin, 1905).
AAPG geologic province:
Alaska Southern 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 ([ ]).