Santonian‒Campanian (Upper Cretaceous) molluscan fossils from the Futakawa Formation, Sotoizumi Group in the Aridagawa area, Wakayama, southwestern Japan

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  • 和歌山県有田川地域の外和泉層群二川層より産する上部白亜系サントニア階‐カンパニアン階軟体動物化石
  • 和歌山県有田川地域の外和泉層群二川層より産する上部白亜系サントニアン階 : カンパニアン階軟体動物化石
  • ワカヤマケン アリタガワ チイキ ノ ソト イズミソウグン ニガワソウ ヨリ サンスル ジョウブ ハクアケイ サントニアン カイ : カンパニアン カイ ナンタイドウブツ カセキ

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Abstract

Upper Cretaceous molluscan assemblages are recognized from the Futakawa Formation at seven localities in the western part of the Aridagawa area, Wakayama, southwestern Japan. The assemblages contain ammonoids and inoceramids such as Texanites (Plesiotexanites) kawasakii, Polyptychoceras (Polyptychoceras) cf. obstrictum, P. (Subptychoceras) cf. yubarense, Inoceramus amakusensis, and Sphenoceramus nagaoi, and they suggest that the strata at these localities are correlated to the Santonian‒lower Campanian. Results of this and previous studies in the Aridagawa area reveal the details of the Santonian to Campanian molluscan composition of the Sotoizumi Group in this area. The Santonian to lower Campanian ammonoid and inoceramid fauna of the Sotoizumi Group is similar to that of the Himenoura Group. These groups, in contrast to the Yezo Group, rarely contain Tetragonites and Damesites in the horizons with abundant specimens of Gaudryceras, Texanites, and Polyptychoceras.

Journal

  • Fossils

    Fossils 100 (0), 125-135, 2016-09-30

    Palaeontological Society of Japan

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