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| original | Middle Oligocene | Late Oligocene | W.Germany(N.Rhine) | Benedek,P.N. Phytoplanktons from the Middle and Upper Oligocene of Tonisberg, (Lower Rhine area). | 1972 |
| original | Middle Oligocene | W.Germany(N.Rhine) | Benedek,P.N. Phytoplanktons from the Middle and Upper Oligocene of Tonisberg, (Lower Rhine area). | 1972 |