| original |
Late Albian |
|
USSR(Urals) |
Bolkhovitina,N.A. Spore and pollen characteristics of Cretaceous layers in the Central Regions of the USSR. |
1953 |
| original |
Cenomanian |
|
USSR(Urals) |
Bolkhovitina,N.A. Spore and pollen characteristics of Cretaceous layers in the Central Regions of the USSR. |
1953 |
| original |
Cenomanian |
|
USSR(WSL) |
Bolkhovitina,N.A. Spore and pollen characteristics of Cretaceous layers in the Central Regions of the USSR. |
1953 |
| details |
Aptian |
|
USSR(Moscow) |
Bolkhovitina,N.A. Spore and pollen assemblage of the Aptian and Albian from the Central Russian Platform. |
1951 |