著者

藤田 裕也 鈴木 寿志 桑原 希世子

出版者

地学団体研究会

雑誌

地球科学 (ISSN:03666611)

巻号頁・発行日

vol.76, no.3, pp.145-150, 2022-07-25 (Released:2022-09-02)

参考文献数

28

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The Guadalupian Follicucullus assemblage, which is made mostly of the genus Follicucullus (Radiolaria), was found from Arida City, Wakayama Prefecture. The fossil locality in the southern area of Arida City is geologically attributed to the Northern Chichibu Belt, which is occupied by such lithologies as chert, sandstone, mudstone and green rocks. Radiolarian fossils were extracted with diluted hydrofluoric acid from a bedded chert layer exposed at the Mandarin Coastal Street. The occurrence of Follicucullus porrectus Rudenko and Follicucullus cf. scholasticus Ormiston et Babcock and the lack of Follicucullus charveti Caridroit et De Wever indicate a Capitanian horizon of the Guadalupian Series. This is the first report of the occurrence of Permian radiolarians from the Arida City area. The significance of the occurrence of Permian chert in the Northern Chichibu Belt is discussed as well as the formative factor of the Follicucullus assemblage (deep water current or oceanic environmental change).