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Geolocation
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Author - title
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Year
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| details | Miocene | W.Germany(N.Rhine) | Potonie,R. et al. Microbotany of Miocene Brown Coal from the Niederrheinische Bucht | 1934 | |
| original | Eocene | Germany | Potonie,R. The microscopic research of Brown Coals.Tertiary pollen forms. | 1931 | |
| original | Miocene | E.Germany(Cottbus) | Potonie,R. The microscopic research of Brown Coals.Tertiary pollen forms. | 1931 |