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Triassic and Jurassic radiolarian fossils from siliceous rock pebbles contained in the Nojimazaki Conglomerate Member of the upper Pliocene Shirahama Formation, Chikura Group, Central Japan

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  • 千倉層群白浜層(上部鮮新統)野島崎礫岩部層の珪質岩小礫から産する三畳紀・ジュラ紀放散虫化石
  • センソウソウグン シラハマソウ(ジョウブ センシントウ)ノジマサキレキガンブソウ ノ ケイシツガン ショウレキ カラ サンスル サンジョウキ ・ ジュラキ ホウサンチュウ カセキ

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Abstract

<p>The Neogene Chikura Group, which is widely exposed in the southeastern part of Minamiboso City, Chiba Prefecture, Japan, is made up of a thick sequence of marine sedimentary rocks deposited in a middle to upper bathyal environment. The group comprises (in ascending order) the Shirahama, Shiramazu, Mera and Hata formations. The upper Pliocene Shirahama Formation is composed mainly of red-brown volcaniclastic sandstone and the Nojimazaki Conglomerate Member. This member comprises volcaniclastic conglomerate with granules to boulders of basalt and andesite, and is characterized by pebbles of andesite, basalt, granodiorite, gabbro, sandstone, siltstone, greenish tuff, and chert. We obtained Anisian and Ladinian (Middle Triassic) radiolarians from chert pebbles, and Bajocian to Callovian (Middle Jurassic) radiolarians from a siliceous siltstone pebble. These Mesozoic pebbles were probably derived from a Mesozoic accretionary complex (present-day Kanto District) in the northwestern part of Boso Peninsula.</p>

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