| Chattian first appearance(expression, geohistory, appearance, period, oligocene) |
| Rupelian first appearance(expression, geohistory, appearance, period, oligocene) |
| paleogene first appearance(expression, appearance, period, oligocene) |
| Extant Lutetian first appearance(expression, geohistory, eocene, period) |
| Extant Ypresian first appearance(expression, geohistory, eocene, period) |
| paleocene first appearance(expression, geohistory, period, oligocene) |
| Actinidia(noun, creature, geohistory, eocene) |
| Adelotus(noun, creature, geohistory, chattian) |
| Adeonellidae(noun, creature, geohistory, eocene) |
| Adeonidae(noun, creature, geohistory, eocene) |
| Aequornithes(noun, creature, geohistory, paleocene) |
| Afroaves(noun, creature, geohistory, paleocene) |
| Afrotheria(noun, creature, geohistory, paleocene) |
| Aldrovanda(noun, creature, geohistory, paleocene) |
| Alectis(noun, creature, geohistory, eocene) |
| Alligatorinae(noun, creature, geohistory, paleocene) |
| Alosa(noun, creature, geohistory, eocene) |
| Amphipoda(noun, creature, geohistory, eocene) |
| Amphistegina(noun, creature, geohistory, eocene) |
| Ampullinopsis(noun, creature, geohistory, paleocene) |