| original |
Ludlovian |
Early Gedinnian |
Spain |
Cramer,F.H. Hoegispheres and other microfossils incertae sedis of the San Pedro Formation (Siluro-Devonian boundary) near Valporquero, Eon, northwest Spain. |
1966 |
| details |
Nd |
|
Nd |
Sarjeant,W.A.S. Xanthidia, Palinospheres and "Hystrix": A review of the study of fossil unicellular microplankton with organic cell walls. |
1970 |
| details |
Silurian |
Devonian |
Nd |
Taugourdeau-Lantz,J. The Tasmanaceae, fossil cysts of the Prasinophyceae. |
1979 |
| details |
Nd |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |