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National Geologic Map Database

Geologic Unit: Naknek

Usage:

Naknek Formation (AK*)


Subunits:

(alphabetical) --all in AK*: Chisik Conglomerate Member, Indecision Creek Sandstone Member, Katolinat Conglomerate Member, Northeast Creek Sandstone Member, Pomeroy Arkose Member, Snug Harbor Siltstone Member.


Geologic age:

Jurassic, Late*


Type section, locality, area and/or origin of name:

From mouth of Naknek Lake to head of Savonoski River, Alaska Peninsula, southwestern AK (Spurr, 1900; Martin, 1926).


AAPG geologic province:

Alaska Southern region*
Alaska Southwestern region*
Alaska Peninsula province*


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 ([ ]).