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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 | Russia(Caucasus) | Zaporozhets,N.I. Lower Oligocene palynology and phytoplankton of the northern Caucasus | 1993 | |
| details | Late Eocene | USSR(Ukrainian SSR) | Zosimovich,V.Y. et al. The boundary between Upper Eocene and Oligocene in the Kiev Dnieper area as based on palynological data. | 1979 |