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Geologic Unit: Idak
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Map showing publication footprint
  • Usage in publication:
    • Idak basalt*
  • Modifications:
    • Named
  • Dominant lithology:
    • Volcaniclastics
    • Volcanics
  • AAPG geologic province:
    • Aleutian Islands province
    • Alaska Southwestern region
Publication:

Byers, F.M., Jr., Hopkins, D.M., Wier, K.L., and Fisher, Bernard, 1947, Volcano investigations on Umnak Island, IN Progress of investigations in 1946: U.S. Geological Survey Alaskan Volcano Investigations Report, no. 2, p. 19-53.


Summary:

[Named for Mount Idak in southwest part of Unalaska 1:250,000 quad, Aleutian Islands, AK.] [no type designated] Occurs on Mount Idak and ridges to northeast. Consists of basalt flows and subordinate interbedded tuff-breccia; thickness is about 2,000 feet. [Unconformably(?) underlies locally unnamed volcanic rocks and alluvium.] Age given as Tertiary and Quaternary [based on regional relations].

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Idak basalt†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Aleutian Islands province
    • Alaska Southwestern region
Publication:

Byers, F.M., Jr., 1959, Geology of Umnak and Bogoslof Islands, Aleutian Islands, Alaska, IN Investigations of Alaskan volcanoes: U.S. Geological Survey Bulletin, 1028-L, p. L267-L369.


Summary:

Name is abandoned. Rocks are, locally, reassigned to Ashishik basalt and to unnamed units.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


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 ([ ]).

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