| Flagtail(noun, creature, geohistory, eocene) |
| Flatfish(noun, creature, geohistory, paleocene) |
| Flying squirrel(expression, creature, geohistory, rupelian) |
| Free-tailed bat(expression, creature, geohistory, eocene) |
| Fungus-growing ants(expression, creature, geohistory, paleocene) |
| Galliformes(noun, creature, geohistory, paleocene) |
| Gavialidae(noun, creature, geohistory, eocene) |
| Gemmula(noun, creature, geohistory, paleocene) |
| Geometer moth(expression, creature, geohistory, eocene) |
| Geometridae(noun, creature, geohistory, eocene) |
| Glaucosoma(noun, creature, geohistory, eocene) |
| Glires(noun, creature, geohistory, paleocene) |
| Gnathophis(noun, creature, geohistory, paleocene) |
| Gnomefish(noun, creature, geohistory, eocene) |
| Gopher(noun, creature, geohistory, eocene) |
| Grebe(noun, creature, geohistory, chattian) |
| Ground squirrel(expression, creature, geohistory, rupelian) |
| Gull(noun, creature, geohistory, rupelian) |
| Gundi(noun, creature, geohistory, rupelian) |
| Halfbeak(noun, creature, geohistory, eocene) |