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Fossil shark teeth from the Namigata Formation in Ibara City, Okayama Prefecture, central Japan and their biostratigraphical significance



Fossil shark teeth from the Namigata Formation in Ibara City, Okayama Prefecture, central Japan and their biostratigraphical significance



Mizunami-shi Kadeki Hakubutsukan Kenkyu Hokoku = Bulletin of the Mizunami Fossil Museum 33: 103-109



Nine species of elasmobranchs are described from the Namigata Formation in Ibara City, Okayama Prefecture, Japan. They are Hexanchus agassizi Cappetta, 1976, Heterodontus sp., Squatina prima (Winkler, 1873), Carcharias acutissima (Agassiz, 1844), Carcharocles auriculatus (Blainville, 1818), Brachycarcharias lerichei (Casier, 1946), Hemipristis curvatus Dames, 1883, Physogaleus secundus (Winkler, 1874), and Negaprion cf. eurybathrodon (Brake, 1862). The occurrences of Hexanchus agassizi, Carcharocles auriculatus, Hemipristis curvatus, and Physogaleus secundus suggest that the geological age of the Namigata Formation is the Eocene. Those four species are first reported from the Eocene in Japan.

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