| Dichobunidae(noun, animal, geohistory, appearance) |
| Diplocynodontinae(noun, animal, geohistory, appearance) |
| Dolichoderus vectensis(expression, animal, geohistory, appearance) |
| Echinopedinidae(noun, animal, geohistory, appearance) |
| Entelodont(noun, animal, geohistory, appearance) |
| Eomyidae(noun, animal, geohistory, appearance) |
| Eosimiidae(noun, animal, geohistory, appearance) |
| Epoicotheriidae(noun, animal, geohistory, appearance) |
| Eutypomyidae(noun, animal, geohistory, appearance) |
| Extant Eocene first appearance(expression, appearance, period, geochronology) |
| Florentiamyidae(noun, animal, geohistory, appearance) |
| Florissantia(noun, animal, geohistory, appearance) |
| Formiciinae(noun, animal, geohistory, appearance) |
| Galecyon(noun, animal, geohistory, appearance) |
| Gigantostrea(noun, animal, geohistory, appearance) |
| Gobiomyidae(noun, animal, geohistory, appearance) |
| Ground sloth(expression, animal, geohistory, appearance) |
| Hegetotheriidae(noun, animal, geohistory, appearance) |
| Heliscomyidae(noun, animal, geohistory, appearance) |
| Hesperocyoninae(noun, animal, geohistory, appearance) |