| details |
Late Champlainian |
|
Canada(Quebec) |
Martin,F. Ordovician chitinozoa and acritarchs of the Saint-Laurent Platform, (Quebec and Southeast Ontario). |
1983 |
| details |
Late Cambrian |
Early Ordovician |
China(Kirin) |
Yin,L.-M. Acritarchs. (In: Study on Cambrian-Ordovician boundary strata and its biota in Dayangcha, Hunjiang, Jilin, China. J.-Y. Chen, editors) |
1985 |
| original |
Late Carboniferous |
Early Permian |
Argentina(Mendoza) |
Ottone,E.G. Santa Maxima Formation palynoflores, Upper Paleozoic, Argentine Republic. |
1989 |
| details |
Llandoverian |
|
Kentucky |
Wood,G.D. Possible evidence for life cycle stages in Lower Silurian organic-walled microphytoplankton, Kentucy, U.S.A. |
1994 |