Authors Year Title
Ehiro & Bando 1985 Late Permian ammonoids from the Southern Kitakami Massif, Northeast Japan.
Transactions and Proceedings of the Palaeontological Society of Japan, N.S., 137: 25-49, fig.1-9, tab.1-8, pl.5-7; Tokyo.
Ehiro, Shimoyama & Murata 1986 Some Permian Cyclolobaceae from the Southern Kitakami Massif, Northeast Japan.
Transactions and Proceedings of the Palaeontological Society of Japan, N.S., 142: 400-408, fig.1-4, pl.79-80; Tokyo.