Two genera of Popanoceratidae (Permian Ammonoidea) from the South Kitakami Belt, Northeast Japan, with a note on the age of the Takakurayama Formation in the Abukuma Massif. Bulletin of the Tohoku University Museum. 2008. 8. 1-8
Two genera of Popanoceratidae (Permian Ammonoidea) from the South Kitakami Belt, Northeast Japan, with a note on the age of the Takakurayama Formation in the Abukuma Massif. Bulletin of the Tohoku University Museum. 2008. 8. 1-8