International Chronostratigraphic Timescale
The interval definitions in this timescale are derived from the following sources:
- K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view
- W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
There are 59 timescales which overlap this one. show
Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.
Interval names marked with † are no longer in current use.
This timescale is used in the definition of 126662 collections
| International Chronostratigraphic Timescale | Obsolete Names for ICS Units | Ten Million Year Bins | Cenozoic Subepochs | |||||
|---|---|---|---|---|---|---|---|---|
| 2.58 | ||||||||
| Paleogene | Oligocene | Chattian | Tertiary † | Cenozoic 4 | Late Oligocene | 23.03 | ||
| Rupelian | Early Oligocene | 27.82 | ||||||
| Eocene | Priabonian | Cenozoic 3 | Late Eocene | 33.9 | ||||
| Bartonian | Middle Eocene | 37.71 | ||||||
| Lutetian | Cenozoic 2 | 41.2 | ||||||
| Ypresian | Early Eocene | 47.8 | ||||||
| Paleocene | Thanetian | Cenozoic 1 | Late Paleocene | 56 | ||||
| Selandian | Middle Paleocene | 59.2 | ||||||
| Danian | Early Paleocene | 61.6 | ||||||
| 66 | ||||||||