Abstract:Thick Miocene basaltic pile has been confirmed in the MITI "Kanazawa-Oki" well which was drilled in the Hokuriku Basin upon the eastern part of Southwest Japan back arcshelf.
An early Middle Pleistocene marker tephra has been found in sediment cores and outcrop in and around the Chikushi Plain of southwestern Japan. This tephra has been correlated to the Yufugawa pyroclastic flow deposits that erupted from East Kyushu at about . Ma using mineral assemblages, refractive indices, chemical components, and fission track ages.
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