| details |
Middle Caradocian |
Middle Ashgillian |
Baltic Sea |
Vecoli,M. et al. Quantitative evaluation of microplankton palaeobiogeography in the Ordovician-Early Silurian of the northern Trans European Suture Zone: implications for the timing of the Avalonia-Baltica collision. |
2001 |
| details |
Middle Caradocian |
Middle Ashgillian |
Germany(Rostock) |
Vecoli,M. et al. Quantitative evaluation of microplankton palaeobiogeography in the Ordovician-Early Silurian of the northern Trans European Suture Zone: implications for the timing of the Avalonia-Baltica collision. |
2001 |
| original |
Late Ordovician |
|
Canada(Quebec) |
Finger,K.L. Conochitina achabae, a new name for Conochitina concava, Achab,1978. |
1983 |
| details |
Early Gamachian |
Late Richmondian |
Canada(Ontario) |
Melchin,M.J. et al. Evolutionary lineages in some Ordovician Chitinozoa. |
1985 |