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Author - title
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Year
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| details | Pliocene | Quaternary | Colombia | Andriessen,P.A.M. et al. Absolute chronology of the Pliocene-Quaternary sediment sequenc the Bogota area, Colombia. | 1993 |
| details | Early Pliocene | Middle Pliocene | Alaska | Ager,T.A. et al. Pliocene terrace gravels of the ancestral Yukon River near Circle Alaska; Palynology, paleobotany, paleoenvironmental reconstruction and region correlation. (In: Tertiary Quaternary Boundaries. T.A. Ager et al, editors) | 1994 |