| original |
Llandoverian |
Wenlockian |
USA |
Cramer,F.H. et al. North American Silurian palynofacies and their spatial arrangement. |
1972 |
| details |
Nd |
|
Nd |
Eisenack,A. et al. Catalog of fossil dinoflagellates, hystrichospheres and related microfossils. Acritarchs. |
1973 |
| details |
Llandoverian |
Wenlockian |
England(Shropshire) |
Dorning,K.J. Silurian acritarchs from the type Wenlock and Ludlow of Shropshire, England. |
1981 |
| details |
Llandoverian |
Wenlockian |
USA |
Dorning,K.J. Silurian acritarchs from the type Wenlock and Ludlow of Shropshire, England. |
1981 |
| details |
Late Llandoverian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |