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  • Usage in publication:
    • Gastineau volcanic group*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Slate
    • Tuff
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Martin, G.C., 1926, Mesozoic stratigraphy of Alaska: U.S. Geological Survey Bulletin, 776, 493 p.


Summary:

[Probably named for Gastineau Peak, Juneau district, southeastern AK.] Consists of andesitic lava at the base with local lenses of slate, overlain by calcareous slate containing marine fossils of Late Triassic age, above which is andesitic tuff overlain by slate. Thickness is probably 5000 ft. Apparently conformably overlies Perseverance slate (new). Apparently conformably underlies Thane group (new). Age is Late Triassic based on fossils from the slate. List of fossils identified by J.B. Reeside, Jr. is included in report.

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


Map showing publication footprint
  • Usage in publication:
    • Gastineau Volcanics*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Ford, A.B., and Brew, D.A., 1993, Geochemical character of upper Paleozoic and Triassic greenstone and related metavolcanic rocks of the Wrangellia terrane in northern Southeastern Alaska, IN Dusel-Bacon, Cynthia, and Till, A.B., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1992: U.S. Geological Survey Bulletin, 2068, p. 197-217.


Summary:

Gastineau Volcanic Group is revised to Gastineau Volcanics because unit is not divisible into formally named formation-rank units. Age is revised from Late Triassic to: Permian(?) to Late Triassic.

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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