| details |
Early Ordovician |
|
USSR(Novgorod) |
Timofeev,B.V. A small palyeontological theodolite table. (A new method of research into fossil microplankton). (In: Collected Palaentological Papers) |
1962 |
| details |
Late Ordovician |
|
USSR(Baltic) |
Downie,C. et al. Bibliography and index of fossil dinoflagellates and acritarchs. |
1965 |
| details |
Early Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Early Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |