| Aceratheriinae(noun, creature, geohistory, appearance, oligocene) |
| Afossochiton(noun, creature, geohistory, appearance, oligocene) |
| Ailuridae(noun, creature, geohistory, appearance, oligocene) |
| Amphechinus(noun, creature, geohistory, appearance, oligocene) |
| Borophaginae(noun, creature, geohistory, appearance, oligocene) |
| Chubutherium(noun, creature, geohistory, appearance, oligocene) |
| Dromornithidae(noun, creature, geohistory, appearance, oligocene) |
| Ekgmowechashala(noun, creature, geohistory, appearance, oligocene) |
| Hanleya(noun, creature, geohistory, appearance, oligocene) |
| Kentriodontidae(noun, creature, geohistory, appearance, oligocene) |
| Mammacyon(noun, creature, geohistory, appearance, oligocene) |
| Merycochoerus(noun, creature, geohistory, appearance, oligocene) |
| Miotylopus(noun, creature, geohistory, appearance, oligocene) |
| Neocynodesmus(noun, creature, geohistory, appearance, oligocene) |
| Octodontotherium(noun, creature, geohistory, appearance, oligocene) |
| Orophodontidae(noun, creature, geohistory, appearance, oligocene) |
| Pampatheriidae(noun, creature, geohistory, appearance, oligocene) |
| Paroreodon(noun, creature, geohistory, appearance, oligocene) |
| Peltephilus(noun, creature, geohistory, appearance, oligocene) |
| Psephophorus(noun, creature, geohistory, appearance, oligocene) |