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Geologic Unit: Sand Bay
Map showing publication footprint
  • Usage in publication:
    • Sand Bay volcanics*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Volcaniclastics
    • Volcanics
  • AAPG geologic province:
    • Aleutian Islands province
    • Alaska Southwestern region
Publication:

Simons, F.S., and Mathewson, D.E., 1947, Geology of Great Sitkin Island, IN Progress of investigations in 1946: U.S. Geological Survey Alaskan Volcano Investigations Report, no. 2, p. 55-69.


Summary:

Pg. 61-63, pls. 4, 5. Sand Bay volcanics. Comprise a lower pyroclastic sequence containing a few thin lava flows, designated the /Sand Bay agglomerate, and an upper sequence of andesite and basalt flows, designated the /Sand Bay lava flows. Overlies Finger Bay volcanics unconformably; older than Great Sitkin volcanics (new). Age is considered late Tertiary based on regional stratigraphic relations.
Form most of southern half of Great Sitkin Island in central part of Aleutian Islands. Well exposed in vicinity of Sand Bay. [Type locality not designated. Named from Sand Bay in northeast part of Adak 1:250,000 quadrangle, Aleutian Islands, southwestern AK.]
[Use of same name for a unit and its constituents conflicts with nomenclature guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 3431); supplemental information from GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Sand Bay volcanices*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Aleutian Islands province
    • Alaska Southwestern region
Publication:

Simons, F.S., and Mathewson, D.E., 1955, Geology of the Great Sitkin Island, Alaska, IN Investigations of Alaskan volcanoes: U.S. Geological Survey Bulletin, 1028-B, 43 p., scale 1:50,000, Prepared in cooperation with U.S. Army, Office Chief Eng


Summary:

Pg. 28-29, pl. 5. Sand Bay volcanics. Comprise a lower pyroclastic sequence consisting of agglomerate and a few thin flows [†Sand Bay agglomerate], and an upper sequence composed of andesitic and basaltic lavas [†Sand Bay lava flows]. Age not certain. Older than Great Sitkin volcanics, which may have been glaciated, and of which at least part are probably of Pleistocene age.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3431).


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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