| original |
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 Gothlandian |
|
Pennsylvania |
Cramer,F.H. Possible implications for Silurian paleogeography from phytoplankton assemblages of the Rose Hill and Tuscarora Formations of Pennsylvania. |
1969 |
| details |
Sheinwoodian |
|
England(Shropshire) |
Swire,P.H. New chitinozoan taxa from the Lower Wenlock (Silurian) of the Welsh Borderlands, England |
1990 |
| details |
Early Gothlandian |
|
Pennsylvania |
Swire,P.H. New chitinozoan taxa from the Lower Wenlock (Silurian) of the Welsh Borderlands, England |
1990 |
| details |
Wenlockian |
Gedinnian |
Libya |
Tekbali,A.O. et al. Silurian spores, acritarchs and chitinozoans from the Bani Walid Borehole of the Ghadamis Basin, Northwest Libya. (In: The Geology of Libya. M.J.Salem et al, editors) |
1991 |
| details |
Nd |
|
Nd |
Verniers,J. et al. A global chitinozoa biozonation for the Silurian |
1995 |