| details |
Middle Ludlovian |
Middle Gedinnian |
Spain |
Cramer,F.H. Palynology of Silurian and Devonian rocks in northwest Spain. |
1966 |
| details |
Middle Ludlovian |
Early Gedinnian |
Spain |
Cramer,F.H. Palynology of Silurian and Devonian rocks in northwest Spain. |
1966 |
| 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 |
Late Llandoverian |
Early Gedinnian |
Spain |
Cramer,F.H. Consideration on the palynology and Silurian paleolatitudes based on microplankton of the Cantabrian Mountains of the Northwest of Spain. |
1969 |
| details |
Llanvirnian |
|
Oklahoma |
Miller,M.A. et al. Clypeolus, a new acritarch genus from the Ordovician and Silurian. |
1997 |