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
- P. L. Gibbard, M. J. Head, and M. J. C. Walker. 2010. Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma. Journal of Quaternary Science 25(2):96-102 view
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
- J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) 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
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 126585 collections
| International Chronostratigraphic Timescale | Ordovician of Australia | Cambrian of Kazakhstan | Ordovician of Ibero-Bohemia | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Bolindian | Kosovian | 443.8 | |||||||||
| Katian | Kralodvorian | Bohdalec † | 445.2 | |||||||||||
| Eastonian | 449 * | |||||||||||||
| Berounian | 449.7 * | |||||||||||||
| Gisbornian | 452 * | |||||||||||||
| Sandbian | 453 | |||||||||||||
| Zahorany †/Vinice | Letna † | 456.2 * | ||||||||||||
| Liben † | 458 * | |||||||||||||
| Middle Ordovician | Darriwilian | Darriwilian | 458.4 | |||||||||||
| Dobrotivian | 458.5 * | |||||||||||||
| Oretanian | 459.7 * | |||||||||||||
| Sarka † | 461.7 * | |||||||||||||
| Dapingian | Yapeenian | Klabava † | 467.3 | |||||||||||
| Arenigian | 468 | |||||||||||||
| Castlemainian | 468.5 * | |||||||||||||
| Early Ordovician | Floian | Chewtonian | 470 | |||||||||||
| Bendigonian | 471.8 * | |||||||||||||
| Lancefieldian | 473.5 * | |||||||||||||
| Tremadocian | Ungurian | Tremadocian | 477.7 | |||||||||||
| Warendian | 482.8 * | |||||||||||||
| 485.4 | ||||||||||||||