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Author - title
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Year
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| details | Early Eocene | France(Marne) | Gruas-Cavagnetto,C. Palynological study of some samples of the Sparnacian of Verzenay, (Paris Basin). | 1964 | |
| details | Claiborne | Early Vicksburg | USA(Gulf Coast) | Frederiksen,N.O. Sporomorph biostratigraphy, floral changes, and paleoclimatology, Eocene and Earliest Oligocene of the eastern Gulf Coast. | 1988 |