| Plesiadapoidea(noun, creature, appearance, paleocene) |
| Prionomyrmex(noun, creature, appearance, eocene) |
| Pristichampsidae(noun, creature, appearance, paleocene) |
| Proborhyaenidae(noun, creature, appearance, eocene) |
| Procerapachys(noun, creature, appearance, eocene) |
| Prolimnocyon(noun, creature, appearance, paleocene) |
| Prorastomidae(noun, creature, appearance, eocene) |
| Proteopithecidae(noun, creature, appearance, eocene) |
| Protocetidae(noun, creature, appearance, eocene) |
| Psephophorus(noun, creature, appearance, oligocene) |
| Pyrocyon(noun, creature, appearance, eocene) |
| Pyrotheria(noun, creature, appearance, paleocene) |
| Raoellidae(noun, creature, appearance, eocene) |
| Remingtonocetidae(noun, creature, appearance, eocene) |
| Rhyssoplax(noun, creature, appearance, oligocene) |
| Rupelian first appearance(expression, appearance, period, oligocene) |
| Sarkastodon(noun, creature, appearance, eocene) |
| Sebecidae(noun, creature, appearance, paleocene) |
| Selandian first appearance(expression, appearance, period, paleocene) |
| Simimyidae(noun, creature, appearance, eocene) |