| details |
Llanvirnian |
|
Canada(Newfoundland) |
Achab,A. Llanvirnian chitinozoans, (Table Head Formation) of Western Newfoundland, Canada. |
1983 |
| original |
Middle Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoa assemblages of the Early Ordovician of eastern Canada. |
1986 |
| details |
Early Ordovician |
|
Canada |
Achab,A. et al. Chitinozoan contribution to the Ordovician and Lower Silurian paleobiogeography. |
1992 |
| details |
Early Ordovician |
|
USA |
Achab,A. et al. Chitinozoan contribution to the Ordovician and Lower Silurian paleobiogeography. |
1992 |
| details |
Early Ordovician |
|
Spitsbergen |
Achab,A. et al. Chitinozoan contribution to the Ordovician and Lower Silurian paleobiogeography. |
1992 |
| details |
Early Ordovician |
|
Australia |
Achab,A. et al. Chitinozoan contribution to the Ordovician and Lower Silurian paleobiogeography. |
1992 |