| Formation |
| Godo Formaion, Tokigawa Group: Lower Langhian, 15.2 - 14.9 Ma, 15.6 - 15.2 Ma (Sandy silt gravels) 15.2 Ma: The last occurrence of Cavitatus lanceolatus 14.9 Ma: The base of diatom Subzone NPD 4Ba 15.6 Ma: The first occurrence of C. lanceolatus (The sandy silt gravels in the Godo Formation includes C. lanceolatus) Kurihara, Y., Horiuchi, S.and Yanagisawa, Y. (2003) Lithostratigraphy and integrated diatom and calcareous nannofossil biostratigraphy of the Miocene sequence in the Iwadono Hills area, Saitama Prefecture, central Japan. Jour. Geol. Soc. Japan, 109(4), p.215 - 233. |
Back & Forth
20230404, ver.1. 20090710