| Pentacrinites(noun, eocene, extinction, genus) |
| Phymosoma(noun, eocene, extinction, genus) |
| Piceoerpeton(noun, eocene, extinction, genus) |
| Pilgrimella(noun, eocene, extinction, genus) |
| Pleuraspidotherium(noun, extinction, paleocene, genus) |
| Pliolophus(noun, eocene, extinction, genus) |
| Poabromylus(noun, fauna, extinction, priabonian) |
| Prionessus(noun, extinction, paleocene, genus) |
| Proaracana(noun, eocene, extinction, genus) |
| Prochetodon(noun, eocene, extinction, genus) |
| Prodinoceras(noun, extinction, paleocene, genus) |
| Propalaeotherium(noun, eocene, extinction, genus) |
| Proplatyarthrus(noun, extinction, genus, oligocene) |
| Proteopithecidae(noun, fauna, extinction, oligocene) |
| Protitanotherium(noun, fauna, extinction, priabonian) |
| Pseudocrypturus(noun, eocene, extinction, genus) |
| Pseudoprotoceras(noun, fauna, extinction, bartonian) |
| Psittacotherium(noun, extinction, paleocene, genus) |
| Purgatorius(noun, extinction, paleocene, genus) |
| Pyrotheria(noun, fauna, extinction, oligocene) |