| Ischyodus dolloi Leriche, 1902 |
| Formation |
| Senhata Conglomerate Member, Amatsu Formation: Lower Messinian, 7.10 - 6.71 Ma 7.10 Ma: The last occurence of small Reticulofenestra interval 6.71 Ma: The rapid increase of Stichocorys peregrina Sawada, T., Shindo, R., Motoyama, I. and Kameo, K. (2009) Geology and radiolarian biostratigraphy of the Miocene and Pliocene Series exposed along the Koitogawa River, Boso Peninsula, Japan. Jour. Geol. Soc. Japan, 115(5), p.206 - 222. Kameo, K., Mita, I. and Fujioka, M. (2002) Calcareous nannofossil biostratigraphy of the Amatsu Formation (Middle Miocene to Lower Pliocene), Awa Group, distributed in the central part of the Boso Peninsula, central Japan. Jour. Geol. Soc. Japan, 108(12), p. 813－828. |
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