Protosphaeridium sigillarum
- Citations total:
- 2
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| details | Late Precambrian | USSR(Yakut ASSR) | Kabankov,V.Y. et al. Biostratigraphic divisions and age of the Late Precambrian deposits of the Kotunkana River. | 1970 | |
| details | Middle Proterozoic | USSR(Siberia) | Ilchenko,L.I. Late Precambrian acritarchs of North Siberia and their stratigraphic significance. | 1973 |