| Cimolodonta(noun, fauna, eocene, extinction) |
| Cormocyon(noun, fauna, extinction, oligocene) |
| Coryphodontidae(noun, fauna, eocene, extinction) |
| Cymatoceras(noun, fauna, extinction, oligocene) |
| Cymatoceratidae(noun, fauna, extinction, oligocene) |
| Denver Formation(expression, geohistory, formation, paleogene) |
| Dinocerata(noun, fauna, eocene, extinction) |
| Dinopanorpidae(noun, fauna, eocene, extinction) |
| Dyrosauridae(noun, fauna, eocene, extinction) |
| Echinopedinidae(noun, fauna, eocene, extinction) |
| Eosimiidae(noun, fauna, extinction, oligocene) |
| Epihippus(noun, fauna, eocene, extinction) |
| Epoicotheriidae(noun, fauna, eocene, extinction) |
| Eucosmodontidae(noun, fauna, eocene, extinction) |
| Eurymylidae(noun, fauna, eocene, extinction) |
| Ferris Formation(expression, geohistory, formation, paleogene) |
| Florentiamyidae(noun, fauna, eocene, extinction) |
| Florissantia(noun, fauna, extinction, oligocene) |
| Formiciinae(noun, fauna, eocene, extinction) |
| Fort Union Formation(expression, geohistory, formation, paleogene) |