| Florentiamyidae(noun, geohistory, eocene, extinction) |
| Florissantia(noun, geohistory, extinction, oligocene) |
| Formiciinae(noun, geohistory, eocene, extinction) |
| Glyptodontopelta(noun, geohistory, fauna, extinction) |
| Gobiomyidae(noun, geohistory, eocene, extinction) |
| Groeberiidae(noun, geohistory, extinction, oligocene) |
| Hallirhoidae(noun, geohistory, eocene, extinction) |
| Hapalodectidae(noun, geohistory, eocene, extinction) |
| Haplohippus(noun, geohistory, eocene, extinction) |
| Henricosborniidae(noun, geohistory, eocene, extinction) |
| Hercoglossidae(noun, geohistory, extinction, oligocene) |
| Hoanghoniinae(noun, geohistory, eocene, extinction) |
| Holosteus(noun, geohistory, extinction, oligocene) |
| Horusornithidae(noun, geohistory, eocene, extinction) |
| Hyaenodontidae(noun, geohistory, eocene, extinction) |
| Hyopsodontidae(noun, geohistory, eocene, extinction) |
| Hyporhina(noun, geohistory, extinction, oligocene) |
| Kogaionidae(noun, geohistory, extinction, paleocene) |
| Lambdopsalidae(noun, geohistory, eocene, extinction) |
| Leptauchenia(noun, geohistory, extinction, oligocene) |