Authors Year Title
Ehiro 1998 Ammonoid biostratigraphy of the Middle Permian in the South Kitakmi Belt, Japan, and correlation with the reference sections on the Tethyan Region and North America.
Proceedings of the Royal Society of Victoria, 110 (1/2): 147-156, 4 figs., Melbourne.
Hayasaka 1963 Some Permian Fossils from Southern Kitakami. III Ammonoidea.
Proceedings of the Japan Academy, 39: 594-599, 7 figs., Tokyo.