	Authors	Year	Title
	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.