| Multituberculata(noun, geohistory, fauna, extinction, oligocene) |
| Omomyidae(noun, geohistory, fauna, extinction, oligocene) |
| Palaeolagus(noun, geohistory, fauna, extinction, oligocene) |
| Palimphyes(noun, geohistory, fauna, extinction, oligocene) |
| Pantolestidae(noun, geohistory, fauna, extinction, oligocene) |
| Peltosaurus(noun, geohistory, fauna, extinction, oligocene) |
| Pyrotheria(noun, geohistory, fauna, extinction, oligocene) |
| Adapidae(noun, creature, geohistory, appearance, eocene) |
| Adapiformes(noun, creature, geohistory, appearance, eocene) |
| Adapinae(noun, creature, geohistory, appearance, eocene) |
| Ambulocetidae(noun, creature, geohistory, appearance, eocene) |
| Amynodontidae(noun, creature, geohistory, appearance, eocene) |
| Anchitheriinae(noun, creature, geohistory, appearance, eocene) |
| Ancylopoda(noun, creature, geohistory, appearance, eocene) |
| Anoplotheriidae(noun, creature, geohistory, appearance, eocene) |
| Anthracotheriidae(noun, creature, geohistory, appearance, eocene) |
| Anthracotherium(noun, creature, geohistory, appearance, eocene) |
| Archaeopithecidae(noun, creature, geohistory, appearance, eocene) |
| Archaeotherium(noun, creature, geohistory, appearance, eocene) |
| Arsinoitheriidae(noun, creature, geohistory, appearance, eocene) |