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| Segments of rock (strata) in chronostratigraphy | Periods of time in geochronology | Notes |
|---|---|---|
| 4 total, half a billion years or more | ||
| 12 total, several hundred million years | ||
| tens of millions of years | ||
| millions of years | ||
| smaller than an age/stage, not used by the ICS timescale | ||
- International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.