Virkkispora sp
- Citations total:
- 2
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| details | Late Carboniferous | Early Permian | Rocha-Campos,A.C. The Tubarao Group in the Brazilian portion of the Parana Basin. (In: Problems in Brazilian Gondwana Geology. J.J.Bigarella, R.D.Becker and I.D.Pinto, editors) | 1967 | |
| details | Late Carboniferous | Poland | GŠ³recka,T. Productive Carbon in Region of Lower Silesia. | 1974 |