Arkonia concava
- Citations total:
- 2
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| original | Late Llanvirnian | USSR(Estonian SSR) | Uutela,A. et al. Ordovician acritarchs from the Rapla borehole, Estonia | 1991 | |
| details | Middle Ordovician | Estonia | Servais,T. The Ordovician Arkonia-Striatotheca acritarch Plexus | 1997 |