| original |
Late Eocene |
|
Bulgaria |
Chernyavska,S. New spore and pollen species from Coal-bearing Paleogene sediments in Bulgaria. |
1970 |
| details |
Middle Oligocene |
|
Bulgaria |
Chernyavska,S. Spore-pollen zones in certain Old Tertiary Coal bearing sediments in Bulgaria. |
1970 |
| details |
Early Tertiary |
|
USA |
Eyde,R.H. Pollen of Alangium |
1972 |
| details |
Oligocene |
|
Bulgaria |
Chernyavska,S. On the stratigraphy of Paleogene deposits of Bulgaria, (palynological data). |
1973 |
| details |
Oligocene |
|
Bulgaria |
Chernyavska,S. Palynological studies on Paleogene deposits in South Bulgaria |
1977 |
| details |
Early Oligocene |
Middle Oligocene |
Bulgaria |
Chernyavska,S. Palynological studies on Paleogene deposits in South Bulgaria. |
1977 |