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Occurrence of Aturia (Cephalopod, Nautilida) from the Miocene Bihoku Group of Hiroshima Prefecture, southwestern Japan

, : Occurrence of Aturia (Cephalopod, Nautilida) from the Miocene Bihoku Group of Hiroshima Prefecture, southwestern Japan.

Aturia fossils were obtained from the Middle Miocene Itabashi Formation, Bihoku Group, in Shinjo-cho and Higashihonmachi, Shobara City, Hiroshima Prefecture. As the results of the taxonomic study of the fossils, it is confirmed that these specimens are referable to Aturia cubaensis (Lea) in shell shape and in major features of its sculpture. It is thought that one of these specimens had been drifted on the warm oceanic current for about a half to one year after death, and it deposited in the sublittoral zone of the muddy bottom in the Setouchi sedimentary basin.


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