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  • Usage in publication:
    • Intricate Basalt*
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
  • AAPG geologic province:
    • Alaska Peninsula province
    • Alaska Southwestern region
Publication:

Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska, IN Geology of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin, 1368-B, p. B1-B86, (incl. geologic map, scale 1:250,000)


Summary:

Type locality designated as exposures around Intricate Bay at southeast end of Iliamna Lake, Iliamna quad, Alaska Peninsula, AK. Consists of black to dark-green olivine-augite basalt which is glassy to porphyritic and exhibits columnar jointing. Is 100 to 150 m thick. Disconformably to unconformably overlies Gibraltar Lake Tuff and all other Tertiary rocks; underlies Quaternary surficial deposits. Is Pliocene(?) age.

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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