| details |
Tremadocian |
|
USSR(Arkhangelsk Oblast) |
Volkova,N.A. et al. New Tremadocian acritarchs from the northern Russian Platform |
1991 |
| original |
Tremadocian |
|
USSR(Estonian SSR) |
Volkova,N.A. et al. New Tremadocian acritarchs from the northern Russian Platform |
1991 |
| details |
Late Tremadocian |
|
Estonia |
Volkova,N.A. Acritarchs from the Cambrian - Ordovician Boundary Beds, (Boring Core M-56), of the Estonian, near Clint Area. |
1993 |
| details |
Early Tremadocian |
|
USSR(Arkhangelsk Oblast) |
Volkova,N.A. Phytoplankton and acritarch research of Cambrian-Ordovician deposits of the Baltic Region |
1995 |
| details |
Tremadocian |
|
USSR(Estonian SSR) |
Volkova,N.A. Phytoplankton and acritarch research of Cambrian-Ordovician deposits of the Baltic Region |
1995 |