| details |
Middle Siegenian |
Emsian |
Spain |
Loeblich,A.R.,Jr. et al. Some new and revised organic-walled phytoplankton microfossil genera. |
1976 |
| details |
Famennian |
|
Paraguay |
Pжthe de Baldis,E.D. Acritarchs and chitinozoans from the Late Devonian of Paraguay. |
1978 |
| details |
Late Ordovician |
|
Czechoslovakia |
VavrdovЎ,M. Further acritarchs and terrestrial plant remains from the Late Orovician at Hlasna Treban (Czechoslovakia) |
1988 |
| details |
Middle Siegenian |
Emsian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Caradocian |
|
Bolivia |
Gagnier,P.Y. et al. New paleontological and geological data on the Ordovician and Silurian of Bolivia |
1996 |