| original |
Early Vendian |
|
USSR(Urals) |
Pykhova,N.G. Precambrian acritarchs of the Moscow Graben and Urals and stratigraphic significance |
1973 |
| details |
Arenigian |
|
USSR(Estonian SSR) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| original |
Early Gothlandian |
|
USSR(Kalinin) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| details |
Early Vendian |
|
USSR(Urals) |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |