| original |
Middle Ordovician |
Early Gothlandian |
USSR(Siberia) |
Timofeev,B.V. Micropaleophytological research into ancient strata. |
1966 |
| details |
Llanvirnian |
Llandoverian |
Czechoslovakia |
SnopkovŠ,P. et al. Biostratigraphy of the Gelnica Group in the Spissko-Gemerski Rudohoris (Mountains), based on palynological data. |
1979 |
| details |
Middle Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Early Cambrian |
|
USSR(Irkutskaya Oblast) |
Fayzulina,Z.Kh. et al. Microfossils from the Lower Cambrian deposits of the Irkutsk Amphitheatre. (In: Mikrofossilii Drevneishikh Otlozhenii. T.F.Vozzhennikova and T.B.Timofeev, editors) |
1973 |
| details |
Early Cambrian |
|
USSR(Irkutskaya Oblast) |
Faizulina,Z.K. et al. Microfossils from the Lower Cambrian deposits of the Irkutsk Amphitheatre. (In: Microfossils of the Oldest Deposits) |
1973 |
| details |
Cambrian |
|
USSR(Baltic) |
Bagdasaryan,L.L. The significance of microphytofossils in the solving of some problems in petroleum geology. (In: Mikrofitofossilii v neftyanoi geologii. N. A. Timoshina, editor) |
1980 |