Early Triassic radiolarians from black siliceous shale and black chert in the Kuzu area of the Ashio Terrane, central Japan

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Other Title
  • 足尾帯葛生地域の黒色珪質頁岩, 黒色チャートから産出する前期三畳紀放散虫
  • アシオタイ クズウ チイキ ノ コクショク ケイシツ ケツガン コクショク チ

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Description

The occurrence of Early Triassic radiolarians in black siliceous shale and black chert intercalated in siliceous claystone of the Paleozoic and Mesozoic sedimentary complex in the Kuzu area of the Ashio Terrane is reported in this paper. This radiolarian fauna is characterized by such Spumellarians as Palaeoscenidiidae, Pantanelliidae, and Sponguriidae. The following species are typical representatives in the present fauna, namely; Archaeosemantis venusta Sashida, Parentactinia nakatsugawaensis Sashida, Protopsium sp., Pantanellium (?) virgeum Sashida, Cryptostephanidium longispinosum (Sashida), and Oertlispongus sp. This fauna is correlative with that of the Parentactinia nakatsugawaensis (Pn) Assemblage of Sugiyama (1992) and is assigned to Spathian in age.

Journal

  • Fossils

    Fossils 59 (0), 23-31, 1995

    Palaeontological Society of Japan

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