| original |
Late Caradocian |
Early Ashgillian |
Sweden |
Grahn,Y. Caradocian and Ashgillian chitinozoa from the subsurface of Gotland |
1982 |
| details |
Late Caradocian |
|
Baltic |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Late Caradocian |
|
Scandinavia |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Caradocian |
Llanvirnian |
Poland |
Bednarczyk,W.S. Chitinozoa-bearing horizons in the Ordovician of Northern Poland in the light of conodont stratigraphy. |
1999 |
| details |
Late Caradocian |
Middle Ashgillian |
Iran |
Ghavidel-Syooki,M. et al. Biostratigraphy and palaeogeography of Late Ordovician chitinozoans from the northeastern Alborz Range, Iran |
2002 |