| details |
Ordovician |
Silurian |
USSR(Russian Platform) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| details |
Middle Ordovician |
|
USSR(Kalinin) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| details |
Late Ordovician |
Early Gothlandian |
India(Karnataka) |
Viswanathiah,M.N. et al. Acritarchs and associated microplankton from the Katageri Formation of the Badami Group, South India. |
1984 |
| details |
Middle Precambrian |
|
India(Karnataka) |
Venkatachalapathy,V. et al. Microplanktonic assemblage from the core specimens of the Iron Ore Formation from the southern parts of Tanigebail area, Chikmagalui District, Karnataka. |
1984 |