| original |
Early Cambrian |
|
Canada(Alberta) |
Downie,C. Lower Cambrian acritarchs from Scotland, Norway, Greenland and Canada. |
1982 |
| details |
Late Ordovician |
|
Czechoslovakia |
VavrdovЎ,M. Some plant microfossils of possible terrestrial origin from the Ordovician of Central Bohemia. |
1984 |
| details |
Early Cambrian |
|
Spitsbergen |
Knoll,A.H. et al. Micropaleontology across the Precambrian-Cambrian boundary in Spitsbergen |
1987 |
| details |
Late Ordovician |
|
Czechoslovakia |
VavrdovЎ,M. Further acritarchs and terrestrial plant remains from the Late Orovician at Hlasna Treban (Czechoslovakia) |
1988 |
| details |
Early Cambrian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |