| original |
Early Cambrian |
|
USSR(Baltic) |
Yankauskas,T.V. New forms of acritarchs in Lower Cambrian of the Pre Baltic. (In: Stratigraphy and Paleontology of the Lower and Middle Cambrian of the USSR. I.T.Zhuravleva, editor) |
1976 |
| details |
Tremadocian |
|
China(Shanghai) |
Hu,Y. Micropalaeoflora from the Early Ordovician in Gaoqiao Region of Shaanxi and its stratigraphic significance. |
1986 |
| details |
Early Cambrian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |