Permian radiolarians from the Kozaki Formation (Kurosegawa Terrane) in the Yatsushiro area, Kumamoto Prefecture, Southwest Japan.
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概要
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The Kozaki Formation belonging to the Kurosegawa Terrane had been assigned to the Middle Permian in age judging from fusulinids. The purposes of this study are establishment of the lithostratigraphy and re-examination of the age based on radiolarian fossils.The Kozaki Formation, about 700m thick, is divided into three members. The Lower Member consists of conglomerate, sandstone, mudstone with limestone. The Middle Member is mainly composed of conglomerate and pebbly sandstone. The Upper Member consists of pebbly mudstone, mudstone and sandstone. The Lower and Upper members yield radiolarian fossils. The radiolarians of the Lower Member indicate Early Permian, and these of the Upper Member denote earliest Late and later Late Permian. Fossil evidence suggests that the Kozaki Formation ranges in age from Early to Late Permian. The Upper Member of the Kozaki Formation probably corresponds to the Kuma Formation.
- 一般社団法人 日本地質学会の論文
一般社団法人 日本地質学会 | 論文
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