| Metanephrocerus(noun, creature, geohistory, ypresian) |
| Miohippus(noun, geohistory, fauna, extinction, oligocene) |
| Multituberculata(noun, geohistory, fauna, extinction, oligocene) |
| Omomyidae(noun, geohistory, fauna, extinction, oligocene) |
| Palaeolagus(noun, geohistory, fauna, extinction, oligocene) |
| Palaeotheriidae(noun, geohistory, fauna, extinction, oligocene) |
| Palimphyes(noun, geohistory, fauna, extinction, oligocene) |
| Pantolestidae(noun, geohistory, fauna, extinction, oligocene) |
| Parapithecidae(noun, geohistory, fauna, extinction, oligocene) |
| Parapithecoidea(noun, geohistory, fauna, extinction, oligocene) |
| Peltosaurus(noun, geohistory, fauna, extinction, oligocene) |
| Proteopithecidae(noun, geohistory, fauna, extinction, oligocene) |
| Pyrotheria(noun, geohistory, fauna, extinction, oligocene) |
| Sirenia(noun, creature, geohistory, ypresian) |
| Xiphiorhynchus(noun, creature, geohistory, ypresian) |
| Ypresiomyrma(noun, creature, geohistory, ypresian) |
| chattian extinction(noun, fauna, extinction, oligocene) |
| oligocene genus extinction(noun, fauna, extinction, oligocene) |
| rupelian extinction(noun, fauna, extinction, oligocene) |
| bartonian first appearance(noun, creature, geohistory, ypresian) |