| Archaeohyrax(noun, creature, geohistory, appearance, fauna) |
| Eosimiidae(noun, creature, geohistory, appearance, fauna) |
| Florissantia(noun, creature, geohistory, appearance, fauna) |
| Hyporhina(noun, creature, geohistory, appearance, fauna) |
| Miohippus(noun, creature, geohistory, appearance, fauna) |
| Palaeotheriidae(noun, creature, geohistory, appearance, fauna) |
| Parapithecidae(noun, creature, geohistory, appearance, fauna) |
| Parapithecoidea(noun, creature, geohistory, appearance, fauna) |
| Proteopithecidae(noun, creature, geohistory, appearance, fauna) |
| 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) |
| Groeberiidae(noun, geohistory, fauna, extinction, oligocene) |
| Hercoglossidae(noun, geohistory, fauna, extinction, oligocene) |
| Holosteus(noun, geohistory, fauna, extinction, oligocene) |
| Leptauchenia(noun, geohistory, fauna, extinction, oligocene) |
| Leptictida(noun, geohistory, fauna, extinction, oligocene) |