Uranidium semicalvum
- Citations total:
- 2
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| original | Early Ashgillian | Middle Ashgillian | Canada(Anticosti Island) | Jacobson,S.R. et al. Acritarch biostratigraphy of the Dicellograptus complanatus graptolite zone from the Vaureal form Ation, (Ashgillian), Anticosti Island, Quebec, Canada. | 1985 |
| details | Ashgillian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |