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From
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Geolocation
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Author - title
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Year
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| details | Namurian A | Namurian B | Poland | Dijkstra,S.J. et al. A monographic revision of Carboniferous megaspores with special consideration to South Limburg, (Netherlands). | 1946 |
| details | Middle Dinantian | Middle Namurian | Poland | Schopf,J.M. et al. An annotated synopsis of Paleozoic fossil spores and the definition of generic groups. | 1944 |
| original | Carboniferous | Poland | Zerndt,J. Megaspores of the Polish Coal Basin. Part 2. the Marginal Group. | 1937 |