Usage:
Hamakua Volcanics (HI*)
[Hawaiian spelling: Hāmākua (U.S. Board on Geographic Names, ca. 2000).]
Subunits:
(alphabetical) --all in HI*: Hopukani Springs Volcanic Member, Liloe Spring Volcanic Member, Pohakuloa Glacial Member, Waihu Glacial Member.
Geologic age:
Quaternary (Pleistocene)*
Type section, locality, area and/or origin of name:
Type section: south wall of Laupahoehoe gulch [Lat. 19 deg. 58 min. 49 sec. N., Long. 155 deg. 14 min. 39 sec. W., Papaaloa 7.5-min quadrangle, Mauna Kea Volcano, Island of Hawaii, HI] (Stearns and Macdonald, 1946).
Reference section: west wall of Pohakuloa Gulch where channel floor reaches 2,935 m [approx. 9,629 feet] elevation, east of Waihu Spring, [approx. Lat. 19 deg. 46 min. 45 sec. N., Long. 155 deg. 30 min. 15 sec. W., Ahumoa 7.5-min quadrangle, Mauna Kea Forest Reserve, south slope of Mauna Kea Volcano, Hawaii Co., Island of Hawaii, HI] (Wentworth and Powers, 1941, p. 1210; Porter, 1979).
Named for exposures along coast of Hamakua District, northwest of Hilo, Island of Hawaii, HI, which is designated as type locality (Macdonald, 1945).
AAPG geologic province:
Hawaii
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 ([ ]).