| Holcorpa(noun, fauna, extinction, priabonian) |
| Holosteus(noun, geohistory, extinction, oligocene) |
| Honanodon(noun, fauna, eocene, extinction) |
| Hukoutherium(noun, fauna, eocene, extinction) |
| Hyporhina(noun, geohistory, extinction, oligocene) |
| Hyposaurus(noun, geohistory, fauna, extinction) |
| Hypsamasia(noun, fauna, eocene, extinction) |
| Hyracotherium(noun, fauna, extinction, lutetian) |
| Idrissia(noun, fauna, eocene, extinction) |
| Kogaionidae(noun, fauna, extinction, paleocene) |
| Lammidhania(noun, fauna, eocene, extinction) |
| Leptauchenia(noun, geohistory, extinction, oligocene) |
| Leptictida(noun, geohistory, extinction, oligocene) |
| Leptictidium(noun, fauna, extinction, priabonian) |
| Leptoreodon(noun, fauna, extinction, priabonian) |
| Leptotragulus(noun, fauna, extinction, priabonian) |
| Linthia(noun, fauna, eocene, extinction) |
| Lithornis(noun, fauna, extinction, bartonian) |
| Lithornithidae(noun, fauna, extinction, bartonian) |
| Lopez de Bertodano Formation(expression, geohistory, formation, paleogene) |