[MIS14-01] Permian radiolarians from chert distributed in the Hashidate area, Itoigawa City, Niigata Prefecture, central Japan
By using standard HF etching technique, we obtained well-preserved radiolarian fossils from red cherts. The radiolarian assemblage is dominated by Latentefistularia and Entactinaria. Albaillellarians are minor, and the following species are identified: Albaillella sinuata Ishiga and Imoto, Pseudoalbaillella scalparata Holdsworth and Jones, and Albaillella sp. Based on the unitary association zone by Xiao et al. (2018), these species indicate the Kungurian age of late Early Permian. The Kungurian age of chert has been commonly reported from the Akiyoshi belt (e.g., Kanmera et al., 1990). Therefore, the chert of the Hashidate area can be considered to be belonged to the Akiyoshi belt.