| Ambulocetidae(noun, fauna, eocene, extinction) |
| Anaptomorphinae(noun, fauna, eocene, extinction) |
| Archaeohyrax(noun, fauna, extinction, oligocene) |
| Archaeopithecidae(noun, fauna, eocene, extinction) |
| Arctocyonidae(noun, fauna, eocene, extinction) |
| Arctostylopida(noun, fauna, eocene, extinction) |
| Asiadapinae(noun, fauna, eocene, extinction) |
| Azibiidae(noun, fauna, eocene, extinction) |
| Baenidae(noun, fauna, eocene, extinction) |
| Bartonian extinction(expression, extinction, period, geochronology) |
| Basilosaurinae(noun, fauna, eocene, extinction) |
| Bennettitales(noun, fauna, extinction, oligocene) |
| Boltysh crater(expression, geology, crater, paleogene) |
| Brontotheriidae(noun, fauna, eocene, extinction) |
| Caedocyon(noun, fauna, extinction, oligocene) |
| Calamophylliopsis(noun, fauna, extinction, oligocene) |
| Cercamoniinae(noun, fauna, eocene, extinction) |
| Chicxulub crater(expression, geology, crater, paleogene) |
| Chota Formation(expression, geohistory, formation, paleogene) |
| Cimolesta(noun, fauna, eocene, extinction) |