Succession of the Middle Miocene to Pliocene series distributed in this area cor respondsto the standard succession of the Niigata sedimentary basin, but is complex because these series include larger amounts of volcanic rocks than that of type area and still remain unknown. From detail field and biostratigraphical study, and fission track dating, the succession and age of the Nanatani, Teradomari and Shiiya formations of the Miocene and the Nishi
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