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Geological time
Geography
| Term | Definition |
|---|---|
| Eon | The longest division of time. In Phanerozoic currently |
| Era | These make up eons. In Cenozoic currently |
| Period | These make up eras. In Quaternary currently |
| Epoch | These make up periods. In Holocene currently |
| Age of earth | 4.55 billion years |