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From
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To
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Geolocation
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Author - title
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Year
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| details | Early Oligocene | Belgium | Weyns,W. Dinophyceae and acritarcha in the "Sands of Grimmertingen" in their type locality, and the stratigraphic problem of Tongrian. | 1970 | |
| details | Early Oligocene | Middle Oligocene | W.Germany(N.Rhine) | Benedek,P.N. et al. The Lower/Middle Oligocene boundary at Doberg near Bunde/Westfalen.1.Phyto and Nannoplankton. | 1976 |
| details | Early Chattian | W.Germany(N.Rhine) | Benedek,P.N. Phytoplankton from the type Chattian (Upper Oligocene) | 1975 |