長門構造帯台地域久下の泥岩から産出した前期ペルム紀放散虫化石
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概要
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Early Permian radiolarian fossils were discovered from mudstone of the Nagato Tectonic Zone, at Hisage in the Dai area, Yamaguchi Prefecture, Southwest Japan. The mudstone consists of a broken formation of alternating beds of sandstone and mudstone. The radiolarian fauna, composed of Albaillella sinuata, Pseudo-tormentus kamigoriensis, Raciditor gracilis and others, indicates late Early Permian (Kungurian) age. This radiolaria-bearing broken formation does not correspond to the clastic rocks of the Akiyoshi terrane, but it corresponds to the formations of the Maizuru terrane or the Hida Gaien terrane.
- 日本地質学会の論文
- 2006-08-15