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Author - title
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Year
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| original | Early Pliocene | Middle Pliocene | Canada(Arctic) | Aksu,A.E. et al. Magnetostratigraphy and palynology Demonstrate at Least 4 Million years of Arctic sedimentation | 1985 |
| original | Early Pliocene | Arctic Ocean | Mudie,P.J. et al. Neogene to recent palynostratigraphy of Circum-Arctic Basins;Results of ODP Leg 104, Norwegian Sea, Leg 105, Baffin Bay, and DSDP Site 611, Irminger Sea. (In: Geological History of the Polar Oceans: Arctic Versus Antarctic. U. Bleil and J.Thiede, editor) | 1990 | |
| original | Early Oligocene | USSR(WSL) | Ushakova,M.V. et al. Lower Oligocene. (In: Stratigraphy of the Mesozoic and Cenozoic of the Western Siberian Lowlands. V.F.Kozyreva, editor) | 1957 |