| details |
Middle Ordovician |
Late Ordovician |
Nd |
Taugourdeau,P. The chitinozoa. |
1979 |
| details |
Llanvirnian |
|
Gondwanaland |
Paris,F. et al. Early Palaeozoic palaeobiogeography of the Variscan Regions |
1990 |
| details |
Early Virgulian |
|
Estonia |
Nolvak,J. Biostratigraphy: Ordovician chitinozoans |
1990 |
| details |
Late Llanvirnian |
|
Baltic |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Late Llanvirnian |
|
Scandinavia |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Late Arenigian |
Early Llanvirnian |
Czech Republic |
Fatka,O. Organic-walled microfossils (Chitinozoa and Acritarcha) from Praha - Cervenн vrch Hill (SЎrka Formation, Middle Ordovician, Prague Basin) |
2003 |
| details |
Arenigian |
|
Germany(Saxony) |
Marek,J. et al. Revision of trilobites of the Griffelschiefer Formation (Ordovician, Schwarzburg anticline, Germany): preliminary results |
2003 |