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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 | Eocene | W.Germany(Hesse) | Potonie,R. The microbotany of the Eocene Brown Coal of the Geiseltal. | 1934 | |
| original | Eocene | Germany | Potonie,R. The microscopic research of Brown Coals.Tertiary pollen forms. | 1931 | |
| details | Early Oligocene | Germany | Thiergart,F. Pollen analysis of the Service of Brown Coal research. | 1940 |