| details |
Nd |
|
Nd |
Rudavskaya,V.A. Systematic principles of sphaeromorphs. (In:Mikrofitofossilii Proterozoya i Rannego Paleozoya SSSR. B.V.Timofeev, editor) |
1974 |
| details |
Late Riphean |
Vendian |
USSR(Urals) |
Chepikova,I.K. et al. Microfossils of the Late Precambrian of the Volga-Ural Regions and their stratigraphic importance and the relationship of the facies character of the host rock |
1976 |
| details |
Late Asselian |
Early Scythian |
India(Bengal) |
Tiwari,R.S. et al. Organic-walled microfossils of doubtful origin in Permian and Triassic sequences on Peninsular India |
1995 |