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Author - title
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| details | Siegenian | Emsian | Czechoslovakia(Morovia) | Cambel,B. et al. Biostratigraphic evaluation of Metasediments in the male Karpathy Mts.Region | 1985 |
| details | Ordovician | Silurian | 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 |