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Author - title
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| details | Late Eocene | Early Oligocene | Alabama | Jaramillo,C. et al. Sequence stratigraphy of the Pachuta-Marianna interval (Upper Eocene-Lower Oligocene) in the U.S. Gulf Coast. | 2001 |
| details | Sluijs,A. et al. From greenhouse to icehouse; organic-walled dinoflagellate cysts as paleoenvironmental indicators in the Paleogene | 2005 |