| Galecyon(noun, creature, geohistory, appearance, eocene) |
| Gastornis(noun, fauna, eocene, extinction) |
| Gigantostrea(noun, creature, geohistory, appearance, eocene) |
| Glyphea(noun, fauna, eocene, extinction) |
| Gobiatherium(noun, fauna, eocene, extinction) |
| Gobiomyidae(noun, creature, geohistory, appearance, eocene) |
| Gryphaea(noun, fauna, eocene, extinction) |
| Hapalorestes(noun, fauna, eocene, extinction) |
| Haplohippus(noun, fauna, eocene, extinction) |
| Harpagolestes(noun, fauna, eocene, extinction) |
| 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) |
| Honanodon(noun, fauna, eocene, extinction) |
| Horusornithidae(noun, creature, geohistory, appearance, eocene) |
| Hukoutherium(noun, fauna, eocene, extinction) |
| Hyaenodon(noun, creature, geohistory, appearance, eocene) |
| Hypertragulidae(noun, creature, geohistory, appearance, eocene) |