| original |
Coniacian |
Santonian |
Japan(Hokkaido I.) |
Takahashi,K. Spore and pollen assemblages from the Upper Cretaceous Futuba Group, northeast Japan. (In: Mikrofossilii Drevneishikh Otlozhenii. T.F.Vozzhennikova and T.B.Timofeev, editors) |
1973 |
| details |
Maastrichtian |
Danian |
Japan(Hokkaido I.) |
Takahashi,K. et al. Palynostratigraphic investigation of the Akkeshi and Tokotan Formation of the Nemuro Group |
1990 |
| details |
Maastrichtian |
Danian |
Japan(Hokkaido I.) |
Takahashi,K. Palynologic study of the Akkeshi and Tokotan Formations of the Nemuro Group, Eastern Hokkaido |
1991 |