| details |
Late Ordovician |
|
USSR(Lithuanian SSR) |
Bagdasaryan,L.L. Micropalaeo-phytological analysis of Cambrian and Ordovician Petroleums of the Baltic Region. |
1965 |
| original |
Early Cambrian |
|
USSR(Estonian SSR) |
Timofeev,B.V. Micropaleophytological research into ancient strata. |
1966 |
| details |
Early Cambrian |
|
USSR(Estonian SSR) |
Sheshegova,L.I. The acritarchs of the Paleozoic. |
1971 |
| details |
Early Paleozoic |
|
Nd |
Cramer,F.H. et al. Lower Paleozoic acritarchs. |
1979 |
| details |
Late Precambrian |
|
USSR(Arkhangelsk Oblast) |
Sivertseva,I.A. et al. Microfossil from Late Precambrian deposits from the Arkhangelsk Oblast. (In: Paleontology of the Precambrian and Early Cambrian.) |
1979 |
| details |
Early Cambrian |
|
USSR(Estonian SSR) |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |