| details |
Arenigian |
|
Morocco |
Cramer,F.H. et al. Late Arenigian (Ordovician) acritarchs from Cis-Saharan Morocco. |
1977 |
| original |
Early Arenigian |
|
Morocco |
Cramer,F.H. et al. Late Arenigian (Ordovician) acritarchs from Cis-Saharan Morocco. |
1977 |
| details |
Early Paleozoic |
|
Nd |
Cramer,F.H. et al. Lower Paleozoic acritarchs. |
1979 |
| details |
Ashgillian |
Early Llandoverian |
Czechoslovakia |
VavrdovЎ,M. New acritarchs and miospores from the Late Ordovician of Hlasna Treban, Czechoslovakia. |
1989 |
| details |
Early Arenigian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |