青森県尻屋層群の放散虫年代

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タイトル別名
  • Radiolarian age of the Shiriya Group in Aomori Prefecture, northeast Japan
  • アオモリケン シリヤソウグン ノ ホウサンチュウネンダイ

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抄録

Fossil evidence of radiolarians reveals the age of the Shiriya Group (olistostrome facies) in the North Kitakami Belt (s. l.). Some olistoliths of chert are Early Jurassic and Middle-Late Jurassic in age. A tuffaceous mudstone sample contains the following radiolarians; Pantanellium lanceola (Parona), Parvicingula boesii (Parona), Pseudodictyomitra sp. cf. P. carpatica (Lozyniak) and others. The association of the radiolarians indicates that the examined sample is late Tithonian-earliest Cretaceous in age. It is not clear whether the tuffaceous mudstone represents a matrix of the olistostrome or it is also an olistolith itself within the olistostrome. It is certain, however, that the formation of the olistostrome continued during late Tithonian-earliest Cretaceous or later in the North Kitakami Belt (s. l.).

収録刊行物

  • 化石

    化石 42 (0), 7-13, 1987

    日本古生物学会

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