Lava flows in upper Waikahalulu Gulch of pre-Makanaka and post-Waihu flows are named Hanaipoe Formation (3rd oldest of Laupahoehoe Group), Mauna Kea Volcano, Island of Hawaii. Overlies Waihu Formation and underlies Makanaka Formation (both new of Laupahoehoe Group). Assigned Pleistocene age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
K-Ar age give minimum of 85,000 +/-13,000 yr B.P.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
Name "Hanaipoe Formation" is here abandoned and applied to chronostratigraphic unit, "Hanaipoean Stage". Volcanic rocks now assigned to Waikahalulu Formation of Laupahoehoe Group. K-Ar ages give from 81,100 +/-23,600 to 69,500 +/-2,600 yr B.P.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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