| Afrotarsius(noun, geohistory, fauna, extinction, oligocene) |
| Archaeohyrax(noun, geohistory, fauna, extinction, oligocene) |
| Bennettitales(noun, geohistory, fauna, extinction, oligocene) |
| Caedocyon(noun, geohistory, fauna, extinction, oligocene) |
| Calamophylliopsis(noun, geohistory, fauna, extinction, oligocene) |
| Cormocyon(noun, geohistory, fauna, extinction, oligocene) |
| Cymatoceras(noun, geohistory, fauna, extinction, oligocene) |
| Cymatoceratidae(noun, geohistory, fauna, extinction, oligocene) |
| Eosimiidae(noun, geohistory, fauna, extinction, oligocene) |
| Florissantia(noun, geohistory, fauna, extinction, oligocene) |
| Groeberiidae(noun, geohistory, fauna, extinction, oligocene) |
| Hercoglossidae(noun, geohistory, fauna, extinction, oligocene) |
| Holosteus(noun, geohistory, fauna, extinction, oligocene) |
| Hyporhina(noun, geohistory, fauna, extinction, oligocene) |
| Leptauchenia(noun, geohistory, fauna, extinction, oligocene) |
| Leptictida(noun, geohistory, fauna, extinction, oligocene) |
| Miohippus(noun, geohistory, fauna, extinction, oligocene) |
| Multituberculata(noun, geohistory, fauna, extinction, oligocene) |
| Omomyidae(noun, geohistory, fauna, extinction, oligocene) |
| Palaeolagus(noun, geohistory, fauna, extinction, oligocene) |