Permian and Triassic molluscan fossils are found from Mitsu-area, Okayama City, Southwest Japan. Permian
bivalve and gastropod fossils are collected from mudstones of the Upper Formation of the Maizuru Group. 4
species of bivalves (Nuculopsis? sp. ind., Leptodesma sp. ind., Streblopteria cf. eichwaldi, Posidonia sp. ind.)
and 5 species of gastropods (Worthenia cf. corrugata, Callitomaria n. sp. cf. stanislavi, Apachella n. sp.
ind., ??Eunemopsis like trochid, ??Yunnania sp.) are identified. Lower Triassic bivalve fossils are collected from sandstones of the Oono Formation. Neoschizodus cf. laevigatus and Bakevellia (Maizuria) kambei are identified.
bivalve and gastropod fossils
the Maizuru Zone