| Alamitophis(noun, fauna, extinction, paleogene) |
| Alvarez hypothesis(expression, geology, hypothesis, paleogene) |
| Ambulocetidae(noun, geohistory, eocene, extinction) |
| Anaptomorphinae(noun, geohistory, eocene, extinction) |
| Araripemydidae(noun, geohistory, extinction, paleocene) |
| Archaeohyrax(noun, geohistory, extinction, oligocene) |
| Archaeopithecidae(noun, geohistory, eocene, extinction) |
| Arctocyonidae(noun, geohistory, eocene, extinction) |
| Arctostylopida(noun, geohistory, eocene, extinction) |
| Asiadapinae(noun, geohistory, eocene, extinction) |
| Azibiidae(noun, geohistory, eocene, extinction) |
| Baenidae(noun, geohistory, eocene, extinction) |
| Bartonian extinction(expression, extinction, period, geochronology) |
| Basilosaurinae(noun, geohistory, eocene, extinction) |
| Bemalambdidae(noun, geohistory, extinction, paleocene) |
| Bennettitales(noun, geohistory, extinction, oligocene) |
| Boltysh crater(expression, geology, crater, paleogene) |
| Brontotheriidae(noun, geohistory, eocene, extinction) |
| Caedocyon(noun, geohistory, extinction, oligocene) |
| Calamophylliopsis(noun, geohistory, extinction, oligocene) |