	Authors	Year	Title
	Ehiro & Araki	1996	Early Carboniferous ammonoid Irinoceras from the Onimaru Formation in the Southern Kitakami Massif, Northeast Japan. Journal of the Geological Society of Japan, 102 (8): 755-757, 2 figs.
	Ehiro & Araki	1997	Permian cephalopods of Kurosawa, Kesennuma City in the Southern Kitakami Massif, Northeast Japan. Paleontological Research, 1 (1): 55-66, 9 figs., Tokyo.