| details |
Late Hirnantian |
Rhuddanian |
Worldwide |
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 |
Early Llandoverian |
|
USSR(Moscow) |
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 |
| original |
Early Llandoverian |
|
USSR(Estonian SSR) |
Nestor,V.K. New chitinozoan species from the Lower Llandoverian of Estonia. |
1980 |
| details |
Early Llandoverian |
|
Estonia |
Nestor,V. Biostratigraphy: Silurian chitinozoans |
1990 |
| details |
Rhuddanian |
|
Belgium |
Grootel,G.Van et al. Chitinozoa systematics and biozonation of the Aeronian and Lower Telychian in four boreholes of the Western Brabant Massif (Belgium). |
1998 |