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Author - title
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Year
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| details | Maastrichtian | Alaska | Takahashi,K. Stratigraphic significance of three important pollen Groups in the Late Upper Cretaceous and Early Palaeogene | 1984 | |
| details | Maastrichtian | Alaska | Takahashi,K. Stratigraphic significance of Triprojectate, Oculata and Callistopollenites pollenites Groups in the Late Upper Cretaceous and Early Palaeogene | 1986 |