| details |
Silurian |
Early Devonian |
USSR(Permsk Oblast) |
Lagutenkova,N.S. et al. New data on Old rocks in the Yaborovskaya area in the northeastern part of the Perm Oblast |
1977 |
| details |
Vendian |
|
USSR(Permsk Oblast) |
Lagutenkova,N.S. et al. Separation of Lower Paleozoic deposits in the northeastern Perm District. (In: Voprosy biostratigrafii i Paleogeografii Neftegazonosnykh Oblastei SSSR.) |
1977 |
| details |
Silurian |
Early Devonian |
USSR(Bashkir ASSR) |
Chibrikova,E.V. Stratigraphy of Devonian and older Paleozoic deposits of the Southern Urals and the Pre-Urals (According to plant Microfssils). |
1977 |
| details |
Early Eifelian |
|
USSR(Urals) |
Batanova,G.P. et al. Paleontological basis and correlation of the Eifelian Stage of the Volgograd-Volgo Region. (In: The Present-Day Importance of Paleontology to Stratigraphy.) |
1982 |
| details |
Early Devonian |
|
USSR(Vologda) |
Nazarenko,A.M. et al. Stratigraphic subdivision of Pre-Upper Eifelian deposits of the Volga Region near Volgograd based on palynologic data |
1984 |
| details |
Ordovician |
Early Devonian |
USSR(Buryat ASSR) |
Butov,Y.P. Some problems of Pre-Mesozoic stratigraphy of Savan-Baikal Mountain Region. 2. New data on the age of Pre-Mesozoic deposits. |
1986 |