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On the fossil teeth of kitefin shark from the middle Miocene Iseyama Formation, Sanada-machi, Nagano Prefecture, central Japan



On the fossil teeth of kitefin shark from the middle Miocene Iseyama Formation, Sanada-machi, Nagano Prefecture, central Japan



Chikyu Kagaku = Earth Science 59(6): 383-388



Three fossil shark teeth which are found from the lowest part of the Middle Miocene (15 Ma) Iseyama Formation in Sanada-machi, Nagano Prefecture, central Japan, were described. These were identified as teeth of kitefin shark, Dalatias licha (Bonnaterre). This is the second record of Dalatias licha in Nagano Prefecture and also the first one from the Northern Fossa Magna region in Nagano Prefecture. The Iseyama Formation is mainly composed of mudstone which grades upward into interbeds, laminated mudstone, laminated sandy mudstone, interbeds and massive mudstone. Therefore, it is estimated by the habitat of Dalatias licha, the lithofacies and the mollusca fossils that the lowest part of the Iseyama Formation was deposited on the shelf slope deeper than 200 meters and the shelf edge.

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