Auxiliary material for this article contains a table of 40Ar/39Ar analytical data for 16 samples (with 1 to 6 subsamples each) of basaltic groundmass and 1 plagioclase from Mauna Loa and Mauna Kea volcanoes, which were analyzed by incremental broad-beam laser heating at the Berkeley Geochronology Center. Additional file information is provided in the readme.txt.

2004GC000846-readme.txtplain text document3Kreadme.txt
ggge626-sup-0002tab01.txtplain text document4KTab-delimited Table 1.

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