Late Triassic-Early Jurassic radiolarians have been obtained from red chert pebbles of the Middle Miocene in eastem part of Shimane Prefecture，Japan.
These fossils are assignable to the Triassocampe deweveri and T. nova to Parahsuum simplum Assembleges which have been reported from bedded chert embedded in the Jurassicmelange of Southwest Japan.
Dominant occurrence of these radiolarian bearing red bedded cherts is restricted in Kanoashi rock of the Nichihara area and Mino Terrane or further north，possible Nadanhada-Westem-Sihotealin Terrane.