| details |
Late Eocene |
|
Bulgaria |
Chernyavska,S. Spore-pollen zones in certain Old Tertiary Coal bearing sediments in Bulgaria. |
1970 |
| details |
Middle Oligocene |
Early Miocene |
Bulgaria |
Chernyavska,S. Spore-pollen zones in certain Old Tertiary Coal bearing sediments in Bulgaria. |
1970 |
| details |
Oligocene |
|
Bulgaria |
Chernyavska,S. et al. Palynological characteristic of Oligocene marine Clays from Varna District. |
1968 |
| details |
Eocene |
|
Bulgaria |
Chernyavska,S. On the stratigraphy of Paleogene deposits of Bulgaria, (palynological data). |
1973 |
| details |
Late Eocene |
|
Bulgaria |
Chernyavska,S. Spore and pollen characteristics of Coal-bearing sediments in the vicinity of the village Pchelarovo, East Rodopi. |
1973 |
| details |
Late Oligocene |
Early Miocene |
W.Germany(N.Rhine) |
Brelie,G.Von Der et al. Pollen flora and phytoplancton in the Cologne Layers and their lithostratigraphy in the Siegburg Graben. |
1981 |