| details |
Late Eocene |
|
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 |
Late Eocene |
|
Bulgaria |
Ivanov,R. et al. Geological, petrographic and palynological data on the age of the Palaeogene Volcanic activity in Western Bulgaria.2. The Paleogene of Kamenica. |
1971 |
| details |
Early Oligocene |
|
Bulgaria |
Ivanov,R. et al. Geological, petrographical and palynological data on the age of the Palaeogene Volcanic activity in Western Bulgaria.3. ThePalogene of Mesta. |
1972 |
| 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 |