| Formation |
| The middle part of the Dainenji Formation: Lower Piacenzian, 3.35 - 3.1 Ma 3.35 Ma: The first occurrence of Globorotalia tosaensis 3.1 Ma: The rapid increase of Neodenticula koizumii Yanagisawa, Y., Takahashi, T., Nagahashi, Y., Yoshida, T. and Kurokawa, K. (2003) Tephra beds of the Pliocene Dainenji Formation distributed in the Pacific side of Fukushima Prefecture, northeastern Japan (part 1): Chronostratigraphy. Bull. Geol. Surv. Japan, vol.54(11/12), p.351-364. |
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