Ammonidium sp. Down.,1973
- Citations total:
- 2
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| original | Early Devonian | USA | Downie,C. Observations on the nature of the acritarchs | 1973 | |
| original | Emsian | Canada(Ontario) | Playford,G. Lower to Middle Devonian acritarchs of the Moose River Basin, Ontario. | 1977 |