| Hayasaka I. (1962) Two species of Tainoceras from the Permian of the Kitakami Mountains, Bulletin of the National Science Museum (Tokyo) 6, 137-142 |
| Nakazawa K., Newell N.D. (1968) Permian bivalves of Japan, Memoirs of the Faculty of Science, Kyoto University, Series of Geology and Mineralogy 35 1, 1-108 |
| Murata M. (1969) Molluscan fauna of the Toyoma Formation (Late Permian), Saito Ho-on Kai Museum of Natural History Research Bulletin 38, 1-22 |
| Murata M., Bando Y. (1975) Discovery of Late Permian Araxoceras from the Toyoma Formation in the Kitakami Massif, northeast Japan, Transactions and Proceedings of the Paleontological Society of Japan, N.S. 97, 22-31 |
| Tazawa J. (1975) Uppermost Permian fossils from the southern Kitakami Mountains, northeast Japan, Journal of the Geological Society of Japan 81, 629-640 |
| Hayami I., Kase T. (1977) A systematic survey of the Paleozoic and Mesozoic Gastropoda and Paleozoic Bivalvia from Japan, University of Tokyo Bulletin 13 |
| Ehiro M., Bando Y. (1978) Discovery of Xenodiscus from the Permian Toyoma Formation of southern Kitakami Massif, Journal of the Geological Society of Japan 84, 37-38 |
| Tazawa J. (1982) Oldhamina from the Upper Permian of the Kitakami Mountains, Japan and its Tethyan Province distribution, Transactions and Proceedings of the Paleontological Society of Japan, N.S. 128, 445-451 |
| Ehiro M., Shimanoyama S., et al (1986) Some Permian Cyclobaceae from the Southern Kitakami Massif, Northeast Japan, Transactions and Proceedings of the Paleontological Society of Japan, N.S. 142, 499-408 |
| Ehiro M., Takizawa F. (1989) Foordiceras and Domatoceras (nautiloid cephalopods) from the Upper Permian Toyoma Formation, southern Kitakami Massif, northeast Japan, Transactions and Proceedings of the Paleontological Society of Japan, N.S. 155, 212-217 |
| Goto M. (1994) Palaeozoic and early Mesozoic fish faunas of the Japanese Islands, The Island Arc 3 1994, 247-254 |
| Ehiro M. (2001) Some addition Wuchiapingian (Late Permian) ammonoids from the Southern Kitakami Massif, Northeast Japan, Paleontological Research 5 2, 111-114 |
| Tazawa J. I. (2012) Late Permian (Changhsingian) brachiopod fauna from Nabekoshiyama in the Kesennuma area, South Kitakami Belt, northeast Japan, Science Reports, Niigata University (Geology) 27, 15-50 |
