| Lutetian extinction(expression, extinction, period, geochronology) |
| Macginitiea(noun, fauna, eocene, extinction) |
| Madtsoia(noun, fauna, extinction, paleogene) |
| Madtsoiidae(noun, fauna, extinction, paleogene) |
| Mesosuchia(noun, fauna, eocene, extinction) |
| Miacidae(noun, fauna, eocene, extinction) |
| Miohippus(noun, fauna, extinction, oligocene) |
| Multituberculata(noun, fauna, extinction, oligocene) |
| Necrosauridae(noun, fauna, eocene, extinction) |
| Neoplagiaulacidae(noun, fauna, eocene, extinction) |
| Notharctidae(noun, fauna, eocene, extinction) |
| Notharctinae(noun, fauna, eocene, extinction) |
| Numidotheriidae(noun, fauna, eocene, extinction) |
| Ojo Alamo Formation(expression, geohistory, formation, paleogene) |
| Oldfieldthomasiidae(noun, fauna, eocene, extinction) |
| Omomyidae(noun, fauna, extinction, oligocene) |
| Oromerycidae(noun, fauna, eocene, extinction) |
| Pakicetidae(noun, fauna, eocene, extinction) |
| Palaeoamasiidae(noun, fauna, eocene, extinction) |
| Palaeochiropterygidae(noun, fauna, eocene, extinction) |