| original |
Late Frasnian |
Early Famennian |
USSR(Ukrainian SSR) |
Sergeeva,L.A. New forms of acritarchs of the Devonian of the Ukrain. (In: Palynological Investigation of the Sedimentary deposits of the Ukrain and Adjacent Regions) |
1976 |
| details |
Frasnian |
Famennian |
USSR(European) |
Sergeyeva,L.A. et al. Upper Devonian microphytofossils of the Dnepr-Donets Depression |
1979 |
| details |
Late Frasnian |
Early Famennian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |