Pg. 40-43. Diamond Head talus breccia. Calcareous talus breccia composed of angular fragments of tuff [Diamond Head tuff] cemented into a porous but fairly compact mass, most of which was accumulated wholly under action of gravity. Mantles extensive areas of slopes of Diamond Head with thickness of 5 to 25, exceptionally 50, feet. Rests against and on Diamond Head tuff. It is probable that some of this is considerably older than the younger basalts and the black ash but it seems best to treat it as the youngest rock of Diamond Head region, exclusive of modern alluvium and talus. [Age is Recent.]
[Named from exposures on slopes of Diamond Head, 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., 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. 896, p. 607); GNU records (USGS DDS-6; Menlo GNULEX).

Pg. 80. Diamond Head talus breccia. Composed of angular fragments of Diamond Head tuff cemented by calcareous cement into a porous fairly compact mass. Thickness commonly 5 to 25 feet, exceptionally up to 50 feet. Rests against and on Diamond Head tuff. No fossils. "Some of it [Diamond Head talus breccia] is older than the Diamond Head black ash, but some of it is still forming." Age is considered Recent.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1112).