GEOLEX

Summary of Citation: Koko

Publication:
Stearns, H.T. and Vaksvik, K.N., 1935, Geology and ground-water
   resources of the Island of Oahu, Hawaii: Hawaii Division of
   Hydrography Bulletin, no. 1, 479 p.

Usage in Publication:
Koko volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Named	Oahu	Volcanics

Summary:
Named for occurrence at Koko Head and Koko Crater cones and associated lava flows [Koko Head 7.5' quad] Island of Oahu. Lava flows include those of Hanauma Bay and Kahauloa Craters. Included as unit in upper part of Honolulu volcanic series. Composed of well-bedded gray to brown tuff, partly palagonitized forming a row of cones and firefountain spatter and lava flows. Overlies soil-covered emerged reef of Waimanalo stand of sea; also overlies with erosional unconformity Koolau volcanic series. Assigned latest Pleistocene or Recent age based on stratigraphic relations.

Summary of Citation: Koko

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 Centre National de la Recherche
   Scientifique (Paris), International Geological Congress,
   Commission on Stratigraphy.

Usage in Publication:
Koko volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Oahu

Summary:
Includes Koko Crater tuff, Koko Head tuff, Hanauma Bay tuff and Kaohikaipu lava [from Koko rift], none of which are regarded as formal names (Winchell, 1947 p.16,21). Covers area of about 3 sq mi extending NE from Koko Head 2 to 5 mi SW of Makapuu Head. No fossils. Age assignment of latest Pleistocene or Recent based on relationship to reef of Waimanalo stand of sea.

Summary of Citation: Koko

Publication:
Hay, R.L. and Iljima, A., 1968, Nature and origin of palagonite
   tuffs of the Honolulu Group on Oahu, Hawaii, IN Coats, R.R.,
   Hay, R.L., and Anderson, C.A., eds., Studies in volcanology;
   a memoir in honor of Howel Williams: Geological Society of
   America Memoir, 116, p. 331-376

Usage in Publication:
Koko volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Oahu

Summary:
Tuffs of Koko Crater are subdivided into stratigraphic units: upper unit, as much as 75 ft thick, consisting of well-stratified, medium-to-coarse-grained tuffs containing accretionary lapilli (ash pisoliths) from 1 to 5 cm in diam., and lower unit of underlying beds forming bulk of cone consisting of crudely bedded to massive lapilli tuffs and coarse tuffs with scattered bombs and blocks. Authors believe "Koko Group" erupted previous to Waimanalo stand of sea based on prominent bench from 5 to 12 ft above sea level cut into tuffs on seaward side of Koko Group and well-developed 4-ft clayey soil locally present on surface of Koko volcanic rocks.

Summary of Citation: Koko

Publication:
Gramlich, J.W., Lewis, V.A. and Naughton, J.J., 1971, Potassium-argon
   dating of Holocene basalts of the Honolulu Volcanic Series:
   Geological Society of America Bulletin, v. 82, no. 5, p.
   1399-1404

Usage in Publication:
Koko Volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Isotopic dating	Oahu

Summary:
K-Ar ages on alkali olivine basalt from Koko lava of Honolulu Volcanic Series range from 43.4 +/-1.0 ka to 35.5 +/-2.2 ka.

Summary of Citation: Koko

Publication:
Stearns, H.T., 1974, Submerged shorelines and shelves in the
   Hawaiian Islands and a revision of some of the eustatic
   emerged shorelines: Geological Society of America Bulletin,
   v. 85, no. 5, p. 795-804

Usage in Publication:
Koko Volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Oahu

Summary:
Koko Volcanics erupted during low stand of sea during either Kawela low or Mamala low of Wisconsinan, not during earlier low [referred to Hay and Iljima, 1968]

Summary of Citation: Koko

Publication:
Langenheim, V.A.M. and Clague, D.A., 1987, Stratigraphic framework
   of volcanic rocks of the Hawaiian Islands; Part II of The
   Hawaiian-Emperor volcanic chain, Chapter 1, IN 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

Usage in Publication:
Koko Volcanics

Modifications:	Geologic Province:	Dominant Lithology:
Abandoned	Oahu

Summary:
Koko Volcanics (in parts) of Stearns and Vaksvik (1935) abandoned as formally named unit and called Koko Crater tuff cone, Hanauma tuff cone, and Koko Head flow (and associated cone), informal units of Honolulu Volcanics.