Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ehiro Masayuki and Takaizumi Yukihiro,"Late Devonian and Early Carboniferous ammonoids from the Tobigamori Formation in the Southern Kitakami Massif, Northeast Japan and their stratigraphic significance",The Journal of the Geological Society of Japan,00167630,The Geological Society of Japan,1992,98,3,197-204_1,https://cir.nii.ac.jp/crid/1390001206237986560,https://doi.org/10.5575/geosoc.98.197