Latest Late Jurassic to early Late Cretaceous radiolarians extracted from a gravel of the calcareous nodule originated from the basal conglomerate of the Pliocene Naarai Formation, Choshi area of Kanto Region, central Japan.

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  • 銚子地域の鮮新統名洗層の基底礫岩に由来する石灰質団塊礫から産したジュラ紀新世末～白亜紀新世前期の放散虫化石
  • チョウシ チイキ ノ センシントウメイセンソウ ノ キテイレキガン ニ ユライ スル セッカイシツ ダンカイレキ カラ サンシタ ジュラキ シン セイマツ~ハクアキ シン セイ ゼンキ ノ ホウサンチュウ カセキ

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Abstract

This paper reports on latest Late Jurassic to early Late Cretaceous radiolarians extracted from a gravel of calcareous nodule that originated from the basal conglomerate of the Pliocene Naarai Formation. The calcareous nodule (ca. 12 cm in length) contains vertebrate bones, and lithologically similar gravels have been known to contain Albian and Tithonian ammonoids. The age of the radiolarians from the calcareous nodule ranges from latest Tithonian to late Cenomanian, based on the occurrence of Holocryptocanium barbui. This age range is concordant with ammonoid ages reported previously from gravels of calcareous nodules derived from the Naarai Formation.

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