Radiolarian age of the Shiriya Group in Aomori Prefecture, northeast Japan

DOI Web Site 9 Citations

Bibliographic Information

Other Title
  • 青森県尻屋層群の放散虫年代
  • 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

Search this article

Abstract

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.).

Journal

  • Fossils

    Fossils 42 (0), 7-13, 1987

    Palaeontological Society of Japan

Citations (9)*help

See more

Details 詳細情報について

Report a problem

Back to top