小岩井浮石の降下年代に関する資料
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概要
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There was discrepancy between previous studies of 14C age of the Koiwai Pumice, erupted from the Akita-Komagatake Volcano, northeastern Japan. It is age-dated as 13, 470±300yr B. P. in Endo (1977) and as 16, 300±500yr B. P. in Inoue (1978). Newly-dated 14C age of the peat bed overlain by the Koiwai Pumice Bed, 14, 930+330-320yr B. P., supports the Endos (1977) report among the previously-suggested 14C ages of the pumice bed.