| original |
Middle Carboniferous |
|
USSR(Ukrainian SSR) |
Ishchenko,A.M. Atlas of microspores and pollen of the Middle Carboniferous Period in the western part of the Donets Basin. |
1952 |
| details |
Moscovian |
|
USSR(Ukrainian SSR) |
Ishchenko,A.M. Spore and pollen analysis of the Lower Carboniferous deposits of the Dnieper-Donets Basin. |
1958 |
| details |
Early Frasnian |
Middle Frasnian |
USSR(Latvian SSR) |
Ozolina,V.R. Spore-pollen spectrum of Frasnian age of Upper Devonian, Latvian SSR. |
1963 |
| details |
Middle Carboniferous |
|
USSR(Rostov) |
Egorov,A.I. et al. Spores and pollen of Middle Carboniferous deposits of the Don Basin. |
1971 |