| Pseudozioidea(noun, creature, eocene, geogistory) |
| Pupfish(noun, creature, geohistory, oligocene) |
| Pyrazus(noun, creature, eocene, geogistory) |
| Rail(noun, creature, eocene, geogistory) |
| Rajiformes(noun, creature, eocene, geogistory) |
| Rhabdammina(noun, creature, geohistory, oligocene) |
| Rhineuridae(noun, creature, geohistory, paleocene) |
| Rhinoceros(noun, creature, eocene, geogistory) |
| Rhinochimaeridae(noun, creature, geohistory, oligocene) |
| Rhodolith(noun, creature, eocene, geogistory) |
| River dolphin(expression, creature, geohistory, oligocene) |
| Roller(noun, creature, eocene, geogistory) |
| Rosalina(noun, creature, eocene, geogistory) |
| Rotifer(noun, creature, eocene, geogistory) |
| Rubiaceae(noun, creature, eocene, geogistory) |
| Rupelian first appearance(expression, geohistory, period, oligocene) |
| Saccogaster(noun, creature, eocene, geogistory) |
| Sacoglossa(noun, creature, eocene, geogistory) |
| Sand dollar(expression, creature, geohistory, paleocene) |
| Sardinella(noun, creature, eocene, geogistory) |