Usage:
Gibraltar Lake Tuff (AK*)
Geologic age:
Tertiary
Oligocene(?)*
Pliocene(?)*
Type section, locality, area and/or origin of name:
Exposures on mountain west of Emerald Lake, south of Iliamna Lake, Iliamna quadrangle, Alaska Peninsula, AK. Named from exposures in mountains west of Gibraltar Lake (Detterman and Reed, 1980).
AAPG geologic province:
Alaska Peninsula province*
Alaska Southwestern 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 ([ ]).