Pachysphaeridium pachyacanthum
- Citations total:
- 3
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| details | Late Llanvirnian | E.Germany(Rostock) | Burmann,G. Further organic microfossils from the Lower Ordovician. | 1970 | |
| details | Early Caradocian | USSR(Estonian SSR) | Burmann,G. Further organic microfossils from the Lower Ordovician. | 1970 | |
| details | Early Caradocian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |