Megaspore type 20
- Citations total:
- 2
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| original | Westphalian | W.Germany | Zerndt,J. The Suitableness of megaspores as guide fossils. | 1938 | |
| original | Westphalian B | Westphalian C | Czechoslovakia | KalibovЎ,M. Megaspores of the Radnice Coal Measure zone of the Kladno-Rakovnik Coal Basin. | 1951 |