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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 | Oligocene | USSR(Pavlodarskaya) | Zaklinskaya,E.D. Material on the history of the flora and vegetation of the Paleogene of northern Kazakhstan in the area of Pavlodar Pr-Irtish. | 1953 | |
| details | Early Oligocene | W.Germany(Rhineland) | Kirchheimer,F. Microfossils from Salt deposits of the Tertiary. | 1950 | |
| details | Oligocene | Miocene | Texas | Wilson,L.R. et al. Fossil spores and pollen of the Bender No.1 and B.D.Griffin No.5 wells, Montgomery County, Texas. | 1949 |