| Epoicotheriidae(noun, creature, geohistory, appearance, eocene) |
| Eutypomyidae(noun, creature, geohistory, appearance, eocene) |
| Florentiamyidae(noun, creature, geohistory, appearance, eocene) |
| Florissantia(noun, creature, geohistory, appearance, eocene) |
| Formiciinae(noun, creature, geohistory, appearance, eocene) |
| Galecyon(noun, creature, geohistory, appearance, eocene) |
| Gigantostrea(noun, creature, geohistory, appearance, eocene) |
| Gobiomyidae(noun, creature, geohistory, appearance, eocene) |
| Hegetotheriidae(noun, creature, geohistory, appearance, eocene) |
| Heliscomyidae(noun, creature, geohistory, appearance, eocene) |
| Hesperocyoninae(noun, creature, geohistory, appearance, eocene) |
| Hoanghoniinae(noun, creature, geohistory, appearance, eocene) |
| Homalodotheriidae(noun, creature, geohistory, appearance, eocene) |
| Horusornithidae(noun, creature, geohistory, appearance, eocene) |
| Hyaenodon(noun, creature, geohistory, appearance, eocene) |
| Hypertragulidae(noun, creature, geohistory, appearance, eocene) |
| Hypertragulus(noun, creature, geohistory, appearance, eocene) |
| Hyporhina(noun, creature, geohistory, appearance, eocene) |
| Hyracodontidae(noun, creature, geohistory, appearance, eocene) |
| Indricotheriinae(noun, creature, geohistory, appearance, eocene) |