| original |
Late Arenigian |
Early Llandeilian |
Australia(W.Australia) |
Playford,G. et al. Ordovician acritarchs from the Canning Basin, Western Australia |
1984 |
| details |
Arenigian |
Late Llanvirnian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Ordovician |
|
Australia(W.Australia) |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |
| details |
Hunneberg |
|
Russia(St.Petersburg) |
Raevskaya,E.G. Early Arenig acritarchs from the Leetse Formation (St. Petersburg region, northwest Russia) and their palaeogeographic significance. |
1999 |