Abstract
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, Pseudotormentus 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.
