U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Gibraltar Lake

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).