| eocene extinction(expression, extinction, period, geochronology) |
| oligocene extinction(expression, extinction, period, geochronology) |
| paleogene genus extinction(expression, extinction, period, geochronology) |
| Acer dettermani(expression, fauna, extinction, rupelian) |
| Acer ivanofense(expression, fauna, extinction, rupelian) |
| Acheronodon(noun, extinction, paleocene, genus) |
| Adocus(noun, fauna, extinction, rupelian) |
| Aegyptopithecus(noun, fauna, extinction, rupelian) |
| Anconodon(noun, extinction, paleocene, genus) |
| Andrewsarchus(noun, fauna, extinction, priabonian) |
| Anoplotheriidae(noun, fauna, extinction, rupelian) |
| Anthidium exhumatum(expression, fauna, extinction, rupelian) |
| Anthidium scudderi(expression, fauna, extinction, rupelian) |
| Anthropornis(noun, fauna, extinction, rupelian) |
| Apidium(noun, fauna, extinction, rupelian) |
| Archaeonycteridae(noun, fauna, extinction, lutetian) |
| Archaeotherium(noun, fauna, extinction, rupelian) |
| Archaeus(noun, fauna, extinction, rupelian) |
| Arctocyon(noun, extinction, paleocene, genus) |
| Arsinoitheriidae(noun, fauna, extinction, rupelian) |