Here’s a tabular comparison between an eon and an era in geological time:
| Feature | Eon | Era |
|---|---|---|
| Duration | Billions of years | Hundreds of millions of years |
| Subdivisions | Eras | Periods, Epochs |
| Significance | Longest and broadest division | Intermediate division between eons and periods |
| Examples | Phanerozoic, Proterozoic, Archean, Hadean | Cenozoic, Mesozoic, Paleozoic, Precambrian |
| Biological Evolution | Major evolutionary events occur within eons | Notable biological events occur within eras |
| Geological Events | Major geological events span eons | Key geological events occur within eras |
| Units | Eonothem (chronostratigraphic unit) | Erathem (chronostratigraphic unit) |
Please note that the durations mentioned are approximate and can vary. Geological time divisions are subject to ongoing research and refinement, so there might be variations in terminology and classification depending on the specific geological framework used.
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