| details |
Early Paleozoic |
|
Nd |
Cramer,F.H. et al. Lower Paleozoic acritarchs. |
1979 |
| details |
Late Campanian |
|
Nd |
Lindgren,S. Algal microfossils of the form genus Tetraporina from Upper Cretaceous Clays, southern Sweden. |
1980 |
| details |
Nd |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| original |
Nd |
|
Nd |
Bujak,J.P. Microplankton from the Barton Beds of the Hampshire Basin, England. |
1973 |
| details |
Ordovician |
|
Nd |
Servais,T. An annotated bibliographical review of Ordovician acritarchs |
1997 |
| original |
Arenigian |
|
Czechoslovakia |
VavrdovЎ,M. New acritarchs from Bohemian Arenig (Ordovician). |
1973 |