| original |
Llandoverian |
Wenlockian |
USA |
Cramer,F.H. et al. North American Silurian palynofacies and their spatial arrangement. |
1972 |
| details |
Ludlovian |
Pridolian |
Romania |
Iliescu,V. A Pridolian, (Uppermost Silurian), palynoprotistologic assemblage from the Moesian Platform--Romania. |
1975 |
| details |
Pridolian |
|
Romania |
Givulescu,R. Fossil flora of Romania. (3rd Supplement) |
1978 |
| details |
Late Llandoverian |
|
Saudi Arabia |
McClure,H.A. Chitinozoan and acritarch assemblages stratigraphy and biogeography of the Early Palaeozoic of Northw West Arabia |
1988 |
| details |
Llandoverian |
Ludlovian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |