Problematicum sp
- Citations total:
- 2
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| details | Astartian | Poland | Gгrka,H. Microfossils from the Upper Jurassic of Magnuszew (Poland). | 1965 | |
| details | Middle Callovian | Late Callovian | Poland | Gгrka,H. Dinoflagellate cysts from Callovian of Lukow (Poland). | 1970 |