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Geologic Unit: Uyak
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Map showing publication footprint
  • Usage in publication:
    • Uyak Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Tuff
    • Basalt
    • Chert
  • AAPG geologic province:
    • Alaska Southwestern region
    • Kodiak province
Publication:

Moore, G.W., 1969, New formations on Kodiak and adjacent islands, Alaska, IN Cohee, G.V., and others, Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1967: U.S. Geological Survey Bulletin, 1274-A, p. A27-A35.


Summary:

Named for village of Uyak, northwest coast of Kodiak Island, AK. Type section designated along west shore of Uyak Bay from 3 km south of Uyak to 4 km northwest of Uyak. Principal rock types are black shale, schistose green tuff, pillow basalt, red and light-gray chert, limestone lenses. Thickness of 6000 m is exposed. Unit thrust over younger rocks to southeast. Intruded by penecontemporaneous ultramafic rocks and by middle Tertiary quartz diorite batholith. Considered to be Triassic age on basis of marine Late Triassic fossils identified by N.J. Silberling (written commun., 1966). Fossils collected from limestone lens 700 m above base of unit at type section.

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


Map showing publication footprint
  • Usage in publication:
    • Uyak Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Southwestern region
    • Kodiak province
Publication:

Fischer, M.A., 1979, Structure and tectonic setting of continental shelf southwest of Kodiak Island, Alaska: American Association of Petroleum Geologists Bulletin, v. 63, no. 3, p. 301-310. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Uyak Formation now recognized as a melange containing tectonic blocks some containing Triassic and others containing Early Cretaceous marine fossils. Age accordingly revised to Early Cretaceous.

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


Map showing publication footprint
  • Usage in publication:
    • Uyak Complex*
  • Modifications:
    • Redescribed
    • Revised
  • AAPG geologic province:
    • Alaska Southwestern region
    • Kodiak province
Publication:

von Huene, Roland, Moore, G.W., and Moore, J.C., 1979, Cross section, Alaska Peninsula, Kodiak Island, Aleutian Trench, IN Contribution from Plate Margins Working Group, U.S. Geodynamics Committee: Geological Society of America Map and Chart Series, MC-28A, 2 sheets, 3 p., scale 1:250,000, See also GSA Bull., v. 90, no. 5, pt. 1, p. 1427-1430 (summary)


Summary:

[Uyak Formation (Moore, 1969)] shown on map and cross sections of Kodiak Island as Uyak Complex. Basalt bodies indicated separately on cross sections. Lower Jurassic blueschist excluded from lower part of Uyak. Age given as Cretaceous on map legend.

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


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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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