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| original | Middle Eocene | Early Oligocene | USSR(Pre-Baltic) | Zauer,V.V. Short description of spores and pollen from Eocene and Lower Oligocene deposits of the Prebaltic. (In: Atlas of Upper Cretaceous, Paleocene and Eocene spore-pollen complexes of various Regions of the USSR). | 1960 |
| original | Middle Eocene | Late Eocene | USSR(Kalinin) | Pokrovskaya,I.M. et al. Palynological basis of the age of the Baltic Amber-bearing deposits | 1960 |