| original |
Arenigian |
|
Spitsbergen |
Bockelie,T.G. Early Ordovician chitinozoa from Spitsbergen. |
1980 |
| details |
Late Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoans of the Upper Arenigian, (Zone D) of the Levis Formation, Quebec, Canada. |
1982 |
| details |
Middle Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoa assemblages of the Early Ordovician of eastern Canada. |
1986 |
| details |
Early Ordovician |
|
Nd |
Achab,A. Provincialism of Ordovician chitinozoans. |
1988 |
| details |
Early Arenigian |
|
Canada(Quebec) |
Achab,A. Ordovician chitinozoan zonation of Quebec and Western Newfoundland. |
1989 |
| details |
Middle Ordovician |
|
Australia(W.Australia) |
Winchester-Seeto,T. et al. The environmental response of Middle Ordovician large organic walled microfossils from the Goldwyer and Nita Formations, Canning Basin, Western Australia. |
2000 |
| details |
Middle Ordovician |
|
Australia(W.Australia) |
Winchester-Seeto,T. et al. Chitinozoans from the Middle Ordovician (Darriwilian) Goldwyer and Nita Formations, Canning Basin (Western Australia). |
2000 |