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Peipan-yama lava, distributed in a vast area in central Hokkaido, was dated by the K-Ar method. The obtained age is 3.4±0.2 Ma. Although many pyroclastic rocks distributed in central Hokkaido have been dated so far, their ages were either 5.7-3.7 Ma or 2.8-0.75 Ma and none of them was between 3.7-2.8 Ma.

K-Ar age of the Peipan-yama lava (andesite) in central Hokkaido.