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| details | Nd | Nd | Dettmann,M.E. et al. Phylogeny and biogeography of Ruffordia, Mohria and Anemia (Schizaeaceae) and Ceratopteris (Pteridaceae): Evidence from in situ, and dispersed spores. | 1992 | |
| details | Late Eocene | Oligocene | Venezuela | Colmenares,O.A. et al. A biostratigraphic study of Paleogene sequences in Southwestern Venezuela | 1993 |