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
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126520 collections
| International Chronostratigraphic Timescale | Cambrian of Kazakhstan | Cambrian of West Avalonia | Obsolete Names for ICS Units | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cambrian | Furongian | Stage 10 | Batyrbaian | 485.4 | |||||||
| Jiangshanian | 489.5 | ||||||||||
| Aksaian | 490.7 * | ||||||||||
| Sakian | 492.2 * | ||||||||||
| Paibian | 494 | ||||||||||
| Miaolingian | Guzhangian | Ayusokkanian | Series 3 † | 497 | |||||||
| Arcadian | 498.4 | ||||||||||
| 499.5 | |||||||||||
| Drumian | Zhanaarykian | 500.5 | |||||||||
| Tuesaian | 503 | ||||||||||
| Wuliuan | Stage 5 † | 504.5 | |||||||||
| 505.3 | |||||||||||
| Series 2 | Stage 4 | Branchian | 509 | ||||||||
| Toyonian | 510 * | ||||||||||
| Botomian | 512.5 * | ||||||||||
| Stage 3 | 514 | ||||||||||
| Atdabanian | 515.6 * | ||||||||||
| Placentian | 517.1 | ||||||||||
| Terreneuvian | Stage 2 | Tommotian | 521 | ||||||||
| 525.5 | |||||||||||
| Fortunian | 529 | ||||||||||
| 538.8 | |||||||||||