905. LOWER JURASSIC RADIOLARIAN ZONES OF SW JAPAN

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  • 905. 西南日本における下部ジュラ系放散虫化石帯
  • 西南日本における下部ジュラ系放散虫化石帯〔英文〕
  • セイナン ニホン ニ オケル カブ ジュラケイ ホウサンチュウ カセキタイ エ

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Abstract

Four Lower Jurassic radiolarian assemblage-zones and four subzones are established on the basis of radiolarian biostratigraphic data from the Inuyama and three other areas of SW Japan. These zones are as follows in ascending order : the Parahsuum simplum (divided into Subzone I to IV), Mesosaturnalis hexagonus (newly proposed), Parahsuum (?) grande and Hsuum hisuikyoense Assemblage-zones. These zones range in age from latest Triassic/earliest Jurassic (Rhaetian/Hettangian?) to early Middle Jurassic (Bajocian). This age assignment is based on comparison with Early to Middle Jurassic radiolarian biostratigraphy established in North America and Turkey.

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