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Geologic Unit: Mokapu
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Map showing publication footprint
  • Usage in publication:
    • Mokapu basalt*
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
  • AAPG geologic province:
    • Oahu
Publication:

Stearns, H.T., 1935, Geography and geology, [Island of Oahu, Hawaii], Part 1, IN Stearns, H.T., and Vaksvik, K.N., Geology and ground-water resources of the Island of Oahu, Hawaii: Hawaii Division of Hydrography Bulletin, no. 1, p. 3-198.


Summary:

Named for Mokapu Peninsula [Mokapu 7.5' quad, Island of Oahu, HI] for 2 small outcrops midway between Ulupau Crater and Puu Hawaiiloa. Included as unit in lower part of Honolulu volcanic series. Composed of nephelite basalt containing phenocrysts of pyroxene and olivine. Underlies with erosional unconformity limestone. Tentatively assigned to Kaena stand of sea based on erosion and age of Puu Hawaiiloa. Assigned middle(?) and late Pleistocene age.

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


Map showing publication footprint
  • Usage in publication:
    • Mokapu basalt*
  • Modifications:
    • Not used
  • AAPG geologic province:
    • Oahu
Publication:

Winchell, Horace, 1947, Honolulu series, Oahu, Hawaii: Geological Society of America Bulletin, v. 58, no. 1, p. 1-48.


Summary:

Mokapu basalt (Stearns, IN Stearns and Vaksvik, 1935) was found to be 2 distinct flows, N outcrop composed of nepheline basalt without melilite and S outcrop composed of nepheline-melilite basalt. S one is considered Mokolea basalt. N one is considered part of Ulupau tuff. Assigned to Kahipa stand of sea based on relationship to Puu Hawaiiloa.

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


Map showing publication footprint
  • Usage in publication:
    • Mokapu basalt*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Oahu
Publication:

Macdonald, G.A., and Davis, D.A., 1956, Zone des Hawaii, Chapter 2, IN Avias, Jacques, and others, Oceanie proprement dite; Fasc. 2 of V. 6, Oceanie: Lexique Stratigraphique International, p. 70-143(?)., Prepared by the Centre National de la Recherche Scientifique (Paris), International Geological Congress, Commission on Stratigraphy


Summary:

Assigned Pleistocene age based on erosion and relationship to Kahipa stand of sea.

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


Map showing publication footprint
  • Usage in publication:
    • Mokapu Basalt†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Oahu
Publication:

Langenheim, V.A.M., and Clague, D.A., 1987, Stratigraphic framework of volcanic rocks of the Hawaiian Islands, Part II, IN The Hawaiian-Emperor volcanic chain, Chapter 1, OF Decker, R.W., Wright, T.L., and Stauffer, P.H., eds., Volcanism in Hawaii: U.S. Geological Survey Professional Paper, v. 1, 1350, p. 55-84. [http://ngmdb.usgs.gov/Prodesc/proddesc_42485.htm]


Summary:

Mokapu Basalt (Stearns, IN Stearns and Vaksvik, 1935) abandoned as formally named unit and part called Ulupau tuff cone (and flow?) and part called Mokolea flow, informal units of Honolulu Volcanics.

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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