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Radiolarian fossils from the Koyamada Formation (lowest Cretaceous) of the Somanakamura Group, northeast Japan

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  • 相馬中村層群小山田層 (最下部白亜系) からの放散虫化石
  • ソウマ ナカムラソウグン コヤマダソウ サイ カブ ハクアケイ カラ ノ ホウ

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Radiolarian fossils have been newly discovered from the uppermost part (Koyamada Formation) of the Somanakamura Group in the eastern marginal zone of the Abukuma Mountains, northeast Japan. The radiolarian fauna contains Pseudodictyomitra sp. cf. P. carpatica (Lozyniak), Sethocapsa sp. cf. S. kaminogoensis Aita, Hemicryptocapsa capita Tan Sin Hok, and so on. This association indicates an early Early Cretaceous age. The age assignment is consistent with that by ammonites (Berriasian).


  • Fossils

    Fossils 46 (0), 11-16, 1989

    Palaeontological Society of Japan

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