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Map showing publication footprint
  • Usage in publication:
    • Massacre Bay Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Conglomerate
    • Tuff
    • Andesite
  • AAPG geologic province:
    • Aleutian Islands province
    • Alaska Southwestern region
Publication:

Gates, Olcott, Powers, H.A., and Wilcox, R.E., 1971, Geology of the Near Islands, Alaska, with a section on the surficial geology of the Near Islands [Attu Island, Agattu Island, and Shemya Island] by J.P. Schafer, IN Investigations of Alaskan volcanoes: U.S. Geological Survey Bulletin, 1028-U, p. U709-U822, (incl. geologic maps, scale 1:63,360)


Summary:

Named Massacre Bay Formation. Consists of coarse sandstone, conglomerate, tuff, and basaltic andesite lava flows. Is at least 500 feet thick. Unconformably overlies basement rocks. Age is probably late Tertiary or early Pleistocene age, based on stratigraphic relations and glacial features.
Type area designated near Massacre Bay, east-central Attu Island, Near Islands, Aleutian Islands, southwestern AK. Also occurs on Lookout Mountain, in Peaceful Valley, on Loaf Island, and on Chirikof Point.

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


Map showing publication footprint
  • Usage in publication:
    • Massacre Bay Formation*
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • Aleutian Islands province
    • Alaska Southwestern region
Publication:

Vallier, T.L., Scholl, D.W., Fischer, M.A., Bruns, T.R., Wilson, F.H., von Huene, Roland, and Stevenson, A.J., 1994, Geologic framework of the Aleutian arc, Alaska, IN Plafker, George, and Berg, H.C., eds., The geology of Alaska: Geological Society of America, The Geology of North America, The Decade of North American Geology (DNAG), v. G-1, p. 367-388.


Summary:

Age is late Miocene on basis of 8 to 6 Ma age range given for unit.

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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