| original |
Middle Riphean |
|
USSR(Urals) |
Pykhova,N.G. Precambrian acritarchs of the Moscow Graben and Urals and stratigraphic significance |
1973 |
| details |
Precambriam |
|
Africa |
Bozhko,N.A. et al. Upper Precambrian biostratigraphy of Africa. |
1975 |
| details |
Early Cambrian |
|
China(Szechwan) |
Wang,F. et al. Spiniferous acritarchs from the Lowest Cambrian, Emei, Sichuan, southwestern China. |
1987 |
| details |
Middle Riphean |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |