	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.
	Ehiro	2002	A time gap at the Permian-Triassic boundary in the South Kitakami Belt, Northeast Japan: An examination based on ammonoid fossils. Saito-Ho-on Kai Museum Research Bulletin, 68: 1-12, 3 fig.
	Ehiro	2006	A new species of Stacheoceras (Permian ammonoid) from the Upper Permian in the South Kitakami Belt, Northeast Japan. Paleontological Research 10 (3):261-264, 2 fig.
	Hayasaka	1954	Younger Paleozoic cephalopods from the Kitakami Mountains, Japan. Journal of the Faculty of Science, Hokkaido University, (4) 8: 361-374, pl.22-23.