Protosphaeridium rugosum
- Citations total:
- 2
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| details | Late Proterozoic | USSR(Russian Platform) | Andreeva,E.M. Guide complexes of plant microfossils of the Upper Proterozoic and lower deposits of the Russian Platform. (In: Palynology, Method and Stratigraphy) | 1973 | |
| details | Riphean | USSR(Siberia) | Timofeev,B.V. et al. Microfossils of the Precambrian, Cambrian and Ordovician. | 1976 |