| details |
Late Riphean |
Ordovician |
USSR(Bashkir ASSR) |
German,T.N. et al. Systematic descriptions of microfossils. (In: Precambrian Microfossils of the USSR. T.V.Yankauskas, editor) |
1989 |
| details |
Vendian |
|
USSR(Kazakh SSR) |
Grigaitis,R.K. et al. New Palaeontological data regarding Precambrian deposits of Yuzhnogo Alatau, Central Kazakhstan |
1989 |
| details |
Late Proterozoic |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Sinian |
|
China(Hopei) |
Ding,L.-F. et al. Discovery of Micrhystridium regulare from Sinian-Cambrian strata in Yichang, Hubei and its stratigraphic significance |
1992 |