| original |
Early Llandoverian |
|
USSR(Estonian SSR) |
Nestor,V.K. New chitinozoan species from the Lower Llandoverian of Estonia. |
1980 |
| details |
Late Ashgillian |
Early Llandoverian |
USSR(Estonian SSR) |
Grahn,Y. Chitinozoan stratigraphy in the Ashgil and Llandovery. (In: A Global Analysis of the Ordovician-Silurian Boundary. L.R.M.Cocks and R.B.Rickards, editors) |
1988 |
| details |
Hirnantian |
|
USSR(Baltic) |
Kaljo,D. et al. East Baltic Region. (In: A Global Analysis of the Ordovician-Silurian Boundary. L.R.M.Cocks and R.B.Rickards, editors) |
1988 |
| details |
Llandoverian |
|
USSR(Baltic) |
Kaljo,D. et al. East Baltic Region. (In: A Global Analysis of the Ordovician-Silurian Boundary. L.R.M.Cocks and R.B.Rickards, editors) |
1988 |
| original |
Late Ordovician |
Early Gothlandian |
USSR(Pskov) |
Nolvak,J. et al. The Taucionys Formation (Holorhynchus Beds) in the Iljinskoje Boring (Pskov District). |
1989 |
| details |
Llandoverian |
Wenlockian |
USSR(Estonian SSR) |
Bassett,M.G. et al. The Baltic Region. (In: A Global Standard for the Silurian System. C.H. Holland and M.G.Bassett, editors) |
1989 |
| details |
Early Llandoverian |
|
Estonia |
Nestor,V. Biostratigraphy: Silurian chitinozoans |
1990 |