| original |
Late Caradocian |
|
Sweden |
Grahn,Y. Middle Ordovician chitinozoa from Oland |
1981 |
| details |
Early Caradocian |
|
Sweden |
Grahn,Y. Ordovician chitinozoa from the Stora Asbotorp Boring in Vastergotland South-Central Sweden |
1981 |
| details |
Caradocian |
Early Ashgillian |
Sweden |
Grahn,Y. Caradocian and Ashgillian chitinozoa from the subsurface of Gotland |
1982 |
| details |
Late Virgulian |
|
Estonia |
Nolvak,J. Biostratigraphy: Ordovician chitinozoans |
1990 |
| details |
Early Harju |
|
Estonia |
Nolvak,J. Biostratigraphy: Ordovician chitinozoans |
1990 |
| details |
Nabala |
|
Estonia |
Nolvak,J. et al. Upper Ordovician South from Tallinn and Boring cores from Sargh Field-Station locality 31 Paekna Quarry |
1990 |
| details |
Nd |
|
Nd |
Nolvak,J. et al. Ordovician chitinozoan zones from Baltoscandia |
1993 |
| details |
Idavere |
|
Baltic |
Lindstrom,M. et al. Post-impact deposits in Tvaren, a marine Middle Ordovican Crater Southern of Stockholm, Sweden |
1994 |
| details |
Onnian |
Early Pushgillian |
Sweden |
Paris,F. Chitinozoan biostratigraphy and palaeoecology. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |