Protosphaeridium sorediforme
- Citations total:
- 4
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| details | Late Precambrian | Romania | Iliescu,V. et al. On the presence of the Lower Cambrian in the East Carpathians: Epimetamorphic Tulghes Series. | 1971 | |
| details | Middle Cambrian | Arenigian | Zambia | VavrdovЎ,M. et al. Lower Palaeozoic microfossils from the Luapula Beds of Mansa area | 1972 |
| details | Middle Proterozoic | USSR(Siberia) | Ilchenko,L.I. Late Precambrian acritarchs of North Siberia and their stratigraphic significance. | 1973 | |
| details | Middle Proterozoic | Romania | Anonymous Biostratigraphic Schemes | 1981 |