| details |
Miocene |
|
Poland |
MackŠ²,S. Pollen grains and spores from Miocene Brown Coals in Lower Silesia.I. |
1959 |
| details |
Early Pleistocene |
|
USSR(Ukrainian SSR) |
Shchekina,N.A. The history of the vegetative Cover of the Southern Ukraine in the Late Pliocene (as to the data of spore-pollen analyis). |
1971 |
| details |
Tertiary |
|
Italy |
Nakagawa,T. et al. Pollen morphology of Zelkovia sicula (Ulmaceae), a recently discovered relic species of the Rueopean Tertiary flora: Description, chromosomal relevance and palaeobotanical significance. |
1998 |