Pg. 91-103. Diamond Head black ash. Black sandy vitric ash, pisolitic. Typical mantle bedding; very small proportion of bedding of clear, wind-produced or dune characteristics. [Wentworth, 1926 (B.P. Bishop Mus. Bull., no. 30) briefly mentions Kupikipikio black ash (p. 40), and describes an unnamed black ash (p. 45) from lower slopes of Diamond Head and around shores of Kupikipikio Point.] Pyroclastic origin indicated by presence of Pele's hair and layers of pisolites. Erupted later than Black Point basalt and Diamond Head tuff. [Age is Recent.]
Type locality: on slopes and near base of Diamond Head. Crops out only in small area at southeast foot of Diamond Head tuff cone [Diamond Head State Monument area, approx. Lat. 21 deg. 15 min. 47 sec. N., Long. 157 deg. 48 min. 53 sec. W., Honolulu 7.5-min quadrangle, Honolulu Co.], and around shores of Kupikipikio Point (Black Point), Island of Oahu, HI.
[Lat./Long. coords. from GNU records (USGS DDS-6; Menlo GNULEX, compiled September, 1988).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1112); GNU records (USGS DDS-6; Menlo GNULEX).

Black sand at Black Point (Kupikipikio Point) formerly described as dune sand and derived from erosion of volcanics (Stearns, IN Stearns and Vaksvik, 1935) is considered to be "ash derived from a very late eruption possibly a little offshore" (Wentworth, 1937 [his Diamond Head black ash]). Five distinct eruptions occurred along Kaimuki-Diamond Head rift, namely, Mauumae basalt, Diamond Head ash, Kaimuki basalt, Black Point basalt, and Black Point ash. Black Point ash overlies emerged fossiliferous boulder conglomerate close to present shore, hence this eruption must have taken place in Recent time.

Source: GNU records (USGS DDS-6; Menlo GNULEX); US geologic names lexicon (USGS Bull. 1200, p. 1112).

[Listed as Diamond Head black ash.] Also known as Kupikipikio black ash of Wentworth (1926) and Black Point ash of Stearns (1940). Outcrops only in small area at southeast foot of Diamond Head tuff cone and on Black Point. Consists of sandy vitric ash and in part wind-blown dunes. No fossils. Eruption occurred after late Pleistocene plus 25-foot Waimanalo stand of sea and at time when sea stood no higher than at present. [Age is considered Recent.]
Type locality: Diamond Head, on slopes and near base [Lat. 21 deg. 15 min. 47 sec. N., Long. 157 deg. 48 min. 53 sec. W., Honolulu 7.5-min quadrangle] Island of Oahu, HI.
[Lat./Long. coords. from GNU records (USGS DDS-6; Menlo GNULEX, compiled September, 1988).]

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

Diamond Head Black Ash (Wentworth, 1937), Diamond Head Tuff (Wentworth, 1926), and Black Point Ash (Stearns, 1940) abandoned as formally named units and included in Diamond Head tuff cone, informal unit in Honolulu Volcanics. Honolulu Volcanics is assigned Pleistocene and Holocene(?) age. [unit is probably Holocene(?) based on earlier authors' works]

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