| original |
Wenlockian |
|
USSR(Belorussian SSR) |
Piskun,L.V. New species of acritarchs from the Ordovician and Silurian deposits of the Brestskaya Basin. (In: New species of Fossils and Plants of Belorussia. G.I. Goretskii, editor) |
1976 |
| details |
Late Llandoverian |
Ludlovian |
USSR(Krasnoyarsk Kray) |
Sheshegova,L.I. The acritarchs of the Silurian of the northern Siberian Platform |
1984 |
| details |
Early Gothlandian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |