| original |
Tremadocian |
|
Canada(Alberta) |
Martin,F. New Ordovician, (Tremadoc), acritarch taxa from the Middle Member of the survey Peak Formation at Wilcox Pass, Southern Canadian Rocky Mountains, Alberta. |
1984 |
| details |
Tremadocian |
Early Arenigian |
China(Kirin) |
Martin,F. et al. Early Ordovician acritarchs from Southern Jilin Province, northeast China. |
1988 |
| details |
Tremadocian |
|
Sweden |
Bagnoli,G. et al. Acritarchs and conodonts from the Cambro-Ordovician Furuhall, (Kopingsklint) Section (Oland, Sweden). |
1988 |
| details |
Late Tremadocian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |