Visbysphaera bonitum
- Citations total:
- 2
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| details | Ludlovian | Gedinnian | Algeria | Jardin©,S. et al. Stratigraphic distribution of acritarchs in the Palaeozoic of the Algerian Sahara. | 1974 |
| details | Wenlockian | Ludlovian | Algeria | Downie,C. Devonian acritarchs. (In: The Devonian System. M.R. House et al, editors) | 1979 |