| Extant Eocene first appearance(expression, eocene, period, appearence) |
| Lutetian first appearance(expression, eocene, period, appearence) |
| Bartonian first appearance(expression, eocene, period, appearence) |
| Priabonian first appearance(expression, eocene, period, appearence) |
| Ypresian first appearance(expression, eocene, period, appearence) |
| Acer dettermani(expression, creature, appearance, eocene) |
| Acer ivanofense(expression, creature, appearance, eocene) |
| Aceratheriinae(noun, creature, appearance, oligocene) |
| Adapidae(noun, creature, appearance, eocene) |
| Adapiformes(noun, creature, appearance, eocene) |
| Adapinae(noun, creature, appearance, eocene) |
| Adapisoriculidae(noun, creature, appearance, paleocene) |
| Afossochiton(noun, creature, appearance, oligocene) |
| Afrotarsius(noun, creature, appearance, eocene) |
| Ailuridae(noun, creature, appearance, oligocene) |
| Alagomyidae(noun, creature, appearance, paleocene) |
| Ambulocetidae(noun, creature, appearance, eocene) |
| Amphechinus(noun, creature, appearance, oligocene) |
| Amynodontidae(noun, creature, appearance, eocene) |
| Anaptomorphinae(noun, creature, appearance, paleocene) |