| details |
Late Cambrian |
Tremadocian |
USSR(Yaroslav) |
Volkova,N.A. Middle and Upper Cambrian acritarchs in the East-European Platform |
1990 |
| details |
Early Ordovician |
|
USSR(Pre-Baltic) |
Volkova,N.A. Middle and Upper Cambrian acritarchs in the East-European Platform |
1990 |
| details |
Late Cambrian |
|
Poland |
Szczepanik,Z. et al. Kambr gгrny we wschodniej czЄoeci regionu kieleckiego Gгr OewiЄtokrzyskich |
2004 |
| details |
Late Cambrian |
Tremadocian |
Russia(Nenets Nat.Okrug) |
Stockfors,M. Cambro-Ordovician microorganisms: Acritarchs and Endoliths |
2005 |