| Microcosmodontidae(noun, fauna, extinction, paleocene) |
| Mixodectidae(noun, fauna, extinction, paleocene) |
| Orohippus(noun, eocene, extinction, genus) |
| Oxyaena(noun, eocene, extinction, genus) |
| Pachyaena(noun, eocene, extinction, genus) |
| Palaeoglaux(noun, eocene, extinction, genus) |
| Palaeonictis(noun, eocene, extinction, genus) |
| Palaeoryctidae(noun, fauna, extinction, paleocene) |
| Palaeotherium(noun, eocene, extinction, genus) |
| Pantodonta(noun, fauna, extinction, priabonian) |
| Paracathartes(noun, eocene, extinction, genus) |
| Paracryptodira(noun, eocene, extinction, genus) |
| Parectypodus(noun, eocene, extinction, genus) |
| Parvitragulus(noun, fauna, extinction, priabonian) |
| Paschatherium(noun, eocene, extinction, genus) |
| Patriofelis(noun, eocene, extinction, genus) |
| Pentacrinites(noun, eocene, extinction, genus) |
| Periptychidae(noun, fauna, extinction, paleocene) |
| Phymosoma(noun, eocene, extinction, genus) |
| Piceoerpeton(noun, eocene, extinction, genus) |