| details |
Late Tournaisian |
Visean |
USSR(Bashkir ASSR) |
Valiullina,R.T. et al. The subdivision of the Lower Carboniferous terrigenous strata of Northwestern Bashkiriya according to spore-pollen and mineralogical analysis of the Clay Rocks. |
1961 |
| details |
Visean |
|
USSR(Bashkir ASSR) |
Musin,M.K. et al. Composite geologic section of Lower Carboniferous terrigenous deposits in Northwest Bashkiria |
1962 |
| details |
Middle Visean |
|
USSR(Urals) |
Burilova,R.V. Changes in the spore assemblages in the section of the West Urals Coal-bearing Formation as a basis for its subdivision. (In: Palynology of Proterophyte and Palaeophyte.S.N.Naumova, editor) |
1974 |
| details |
Early Carboniferous |
|
USSR(Udmurt ASSR) |
Bludorov,A.P. et al. The presence of Coal in the Lower Carboniferous of Southern Udmurtia. |
1961 |
| details |
Visean |
|
USSR(Bashkir ASSR) |
Bludorov,A.P. et al. Coal in the Lower Carboniferous of Northwestern Bashkiria |
1958 |