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| Segments of rock (strata) in chronostratigraphy | Time spans in geochronology | Notes to geochronological units |
|---|---|---|
| 4 total, half a billion years or more | ||
| 14 total, several hundred million years | ||
| tens of millions of years | ||
| millions of years | ||
| subdivision of an age, not used by the ICS timescale | ||
References
These references will appear in the article, but this list appears only on this page.- Cohen, K.M.; Finney, S.; Gibbard, P.L. (2013), International Chronostratigraphic Chart (PDF), International Commission on Stratigraphy.