Fossil Molluscan Fauna in the Lower Pleistocene Kazusa Formation, Shimabara Peninsula, Northwestern Kyushu

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  • 長崎県島原半島に分布する下部更新統加津佐層の貝化石相
  • ナガサキケン シマバラ ハントウ ニ ブンプ スル カブ コウシントウ カズサソウ ノ カイカセキソウ

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Abstract

The uppermost part of the lower Pleistocene Kazusa Formation is a marine deposit which is characterized by Thalassinoides isp., lenticular-wavy-flaser bedding, and marine mollusks. At the Tsubami outcrop, an upward shallowing sequence from mid-bay or lower intertidal zone to tidal flat and salt marsh was observed. The Theora association, which is composed of many fossils of Theora fragilis, occurred from the lowermost clay bed, while the Scapharca-Volachlamys association which mainly consists of Anomia chinensis, Ostrea denselamellosa, Volachlamys hirasei, Scapharca kagoshimensis, and Meropesta capillacea, were collected from the upper sand bed. All species from the Kazusa Formation are now living. V. hirasei and M. capillacea are well-known relict species now restricted to the Chinese continent and the Ariake-Seto Inland Sea faunas, and are the oldest records in Japan. Thus, the molluscan assemblage from the Kazusa Formation is the oldest tidal flat to embayment fauna that includes some relict species of the Chinese continent, which appeared in Japan during the Early Pleistocene.

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