Abstract
Permian radiolarian fossils were discovered from greenish gray felsic tuff of the Nagato Tectonic Zone, at Soegasako in the Nishiichi area, Yamaguchi Prefecture, Southwest Japan. The radiolarian fauna is composed of Follicucullus sp. cf. F. porrectus, Pseudoalbaillella sp. aff. P. longicornis, Cauletella manica, Raciditor gracilis, Pseudotormentus kamigoriensis and others. It indicates late Middle to Late Permian in age. The lithology of felsic tuff, age of radiolarian fauna and characteristics of sponge spicule fauna look similar to those of the clastic rocks of the Akiyoshi terrane. Therefore, Paleozoic formation in the Nagato Tectonic Zone of the Nishiichi area corresponds to the Akiyoshi terrane.
