Spore type 21 Zern.,1931
- Citations total:
- 2
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| original | Carboniferous | Poland | Zerndt,J. Megaspores as guide fossils of the productive Coal Measures. | 1931 | |
| original | Namurian | Bashkirian | USSR(Ukrainian SSR) | Ishchenko,A.M. et al. Megaspores of the Carboniferous age and their stratigraphic importance | 1962 |