| Hukoutherium(noun, fauna, eocene, extinction) |
| Hypisodus(noun, fauna, extinction, chattian) |
| Hyposaurus(noun, fauna, extinction, paleogene) |
| Hypsamasia(noun, fauna, eocene, extinction) |
| Idrissia(noun, fauna, eocene, extinction) |
| Ilariidae(noun, fauna, extinction, chattian) |
| Isotemnidae(noun, fauna, extinction, chattian) |
| Kogaionidae(noun, fauna, extinction, paleocene) |
| Lammidhania(noun, fauna, eocene, extinction) |
| Leptaucheniinae(noun, fauna, extinction, chattian) |
| Leptomeryx(noun, fauna, extinction, chattian) |
| Limnenetes(noun, fauna, extinction, rupelian) |
| Linthia(noun, fauna, eocene, extinction) |
| Lopez de Bertodano Formation(expression, geohistory, formation, paleogene) |
| Machaeroides(noun, fauna, eocene, extinction) |
| Madtsoiidae(noun, fauna, extinction, paleogene) |
| Mammalodontidae(noun, fauna, extinction, chattian) |
| Mene oblonga(expression, fauna, extinction, rupelian) |
| Merycoides(noun, fauna, extinction, chattian) |
| Merycoidodon(noun, fauna, extinction, chattian) |