| details |
Early Caradocian |
|
Baltic |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Early Caradocian |
|
Scandinavia |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Caradocian |
|
USSR(Estonian SSR) |
BergstrŠ¶m,S.M. et al. Nomenclature, stratigraphy, chemical fingerprinting and areal distribution of some Middle Ordovician K-Benonites in Baltoscandia. |
1995 |
| details |
Keila |
|
USSR(Estonian SSR) |
Grahn,Y. et al. Precise chitinozoan dating of Ordovician impact events in Baltoscandia. |
1996 |