下部更新統上総層群野島層今泉砂礫岩部層から採取されたタマガイ科絶滅種 Glossaulax hyugensis (Shuto)(軟体動物門，腹足綱)の発見とその意義

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  • An extinct naticid species Glossaulax hyugensis (Shuto) (Mollusca: Gastropoda) from the Lower Pleistocene Imaizumi Sandstone and Conglomerate Member in the Nojima Formation (Kazusa Group, central Japan): Discovery and implications
  • カブ コウシントウ カズサソウグン ノジマソウ イマイズミ サレキガンブソウ カラ サイシュ サレタ タマガイカ ゼツメツシュ Glossaulax hyugensis (Shuto)(ナンタイドウブツモン,ハラ ソク ズナ)ノ ハッケン ト ソノ イギ

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A juvenile specimen of Glossaulax hyugensis (Shuto) was collected from the Lower Pleistocene Imaizumi Sandstone and Conglomerate Member in the Nojima Formation. This formation is in the lower part of the Kazusa Group, a forearc-basin-fill sequence exposed on the Pacific Ocean side of central Japan. The specimen was found in a 9-m-thick conglomeratic sandstone bed in a channel-fill sequence. G. hyugensis is characteristic of the warm- and shallow-water Kakegawa fauna, which flourished on the Pacific Ocean side of southwestern Japan during the Late Pliocene to Early Pleistocene. The stratigraphic level at which the fossil was found is estimated to lie above the KGP tuff bed (2.5 Ma) and below the Olduvai subchronozone (1.97 Ma). This finding marks one of the latest fossil records for the species and suggests that it occurred for a long time period in the southern Kanto area, from the Late Pliocene to Early Pleistocene.

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  • 化石

    化石 102 (0), 63-71, 2017-09-30

    日本古生物学会

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