| original |
Early Llanvirnian |
|
Czechoslovakia |
VavrdovЎ,M. Nethromorphitae and some other acritarchs from the Bohemian Lower Ordovician |
1978 |
| details |
Nd |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Early Tremadocian |
|
Belgium |
Martin,F. Systematic revision of the acritarch Ferromia Pellita and its bearing on Lower Ordovician stratigraphy |
1996 |
| details |
Ordovician |
|
Nd |
Servais,T. An annotated bibliographical review of Ordovician acritarchs |
1997 |