| details |
Early Ordovician |
|
USSR(Russian Platform) |
German,T.N. Microfossils of Glauconite Layers (Data resulting from an investigation of a core from a borehole near Vologda). (In:Mikrofitofossilii Proterozoya i Rannego Paleozoya SSSR. B.V.Timofeev, editor) |
1974 |
| details |
Arenigian |
|
China(Shanghai) |
Hu,Y. Micropalaeoflora from the Early Ordovician in Gaoqiao Region of Shaanxi and its stratigraphic significance. |
1986 |
| details |
Vendian |
|
USSR(Pre-Baltic) |
Hu,Y. Micropalaeoflora from the Early Ordovician in Gaoqiao Region of Shaanxi and its stratigraphic significance. |
1986 |
| details |
Vendian |
|
USSR(Pre-Baltic) |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |