| original |
Early Permian |
|
USSR(Urals) |
Dyupina,G.V. Acritarchs of terrigenous deposits in the Lower Permian of the northern Urals. (In: Upper Paleozoic Terrigenous Deposits of the Urals.) |
1970 |
| details |
Asselian |
|
USSR(Urals) |
Chuvashov,B.I. et al. Faunal complexes and problems of the correlation of diverse facies deposits (Asselian Stage of the western slope of the Middle Urals). (In: The Biostratigraphy and Paleobiogeography of the Devonian and Carboniferous, Asian USSR. V.N.Dubatolov et al, editors) |
1978 |
| details |
Early Permian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |