Microfossil assemblages associated with argonaut fossils from the Middle Miocene Fujina Formation, Shimane Prefecture, Southwest Japan

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  • Matsuura Yasutaka
    Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University
  • Irizuki Toshiaki
    Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University
  • Hayashi Hiroki
    Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University

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  • 島根県中部中新統布志名層下部から産出したタコブネ類化石と共産する微化石群集
  • シマネケン チュウブ チュウ シントウフ シメイソウ カブ カラ サンシュツ シタ タコブネ ルイカセキ ト キョウサン スル ビカセキ グンシュウ

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Abstract

Specimens of the fossil argonaut Mizuhobaris izumoensis Yokoyama, a recognized indicator of the influence of the Paleo-Tsushima Warm Current, were obtained continuously through the lower part of the Middle Miocene Fujina Formation near Shinji High School, 30 km west of central Matsue City, Southwest Japan. Ostracode and planktonic foraminiferal assemblages from this site were studied to clarify the depositional environment. A total of 20 ostracode species and 12 planktonic foraminiferal species were obtained. Neither of these assemblages contained tropical species but both contained temperate species. The common presence of M. izumoensis suggests that its occurrence sites may not necessarily reflect the influence of the Paleo-Tsushima Warm Current.

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