Protrisporites
- Citations total:
- 1
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| details | Namurian A | Westphalian | USSR(Ukrainian SSR) | Semichatova,S.V. et al. The Bashkirian Stage as a global stratigraphic unit. (In: The Carboniferous of the USSR. 8th International Congress of Carboniferous Stratigraphy and Geology. R.H.Wagner et al, editors) | 1979 |