Acrosphaeridium
- Citations total:
- 2
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| original | Early Caradocian | USSR(Estonian SSR) | Uutela,A. et al. Ordovician acritarchs from the Rapla borehole, Estonia | 1991 | |
| details | Ordovician | Nd | Servais,T. An annotated bibliographical review of Ordovician acritarchs | 1997 |