| details |
Llandoverian |
|
Alabama |
Cramer,F.H. Paleographic considerations with regard to a microplanctonic association of the Gothlandian series of Birmingham, (Alabma, USA) |
1968 |
| 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 |
Early Gothlandian |
|
Pennsylvania |
Cramer,F.H. Possible implications for Silurian paleogeography from phytoplankton assemblages of the Rose Hill and Tuscarora Formations of Pennsylvania. |
1969 |
| details |
Early Ludlovian |
|
Bolivia |
Cramer,F.H. et al. Late Silurian chitinozoans and acritarchs from Cochabamba, Bolivia. |
1974 |
| details |
Silurian |
|
Bolivia |
Volkheimer,W. et al. Stratigraphic significance of Paleozoic and Mesozoic microflora from Argentina and neighboring countries. |
1976 |
| details |
Llandoverian |
Early Siegenian |
Spain |
Rodriguez Gonzalez,R.M. Palynology of the Upper Silurian-Lower Devonian Formations of the Cantabrica Cordillera, Northeast Spain. |
1983 |