| details |
Eifelian |
Frasnian |
USSR(Udmurt ASSR) |
Ostrovskii,M.I. et al. New information on the structure of the terrigenous Devonian of the central and southern regions of the Udmurtian ASR in connection with the direction of oil-prospecting opertions. |
1965 |
| details |
Early Frasnian |
|
USSR(European) |
Raskatova,L.G. Middle and Upper Devonian spore-pollen complexes of the southeastern part of the Central Devonian Field. |
1969 |
| details |
Early Frasnian |
|
USSR(Voronezh) |
Shishova,G.M. Spore subassemblages of the Lower Shchigrovian horizon and their relationship to the lithologic composition of the enclosing rocks. (In: Some Questions on the Stratigraphy of the Sedimentary Cover of the Voronezh Anticline. V.P.Semenov, editor) |
1975 |