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
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
- D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126701 collections
| International Chronostratigraphic Timescale | Ten Million Year Bins | Cambrian of North America | Cambrian of Siberia | Cambrian of West Avalonia | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cambrian | Furongian | Stage 10 | Cambrian 5 | Franconian †/Dresbachian/Millardan | Batyrbaian | Tavgian † | Ketyan †/Yurakian | 485.4 | ||||
| Sunwaptan | 487.5 | |||||||||||
| Jiangshanian | 489.5 | |||||||||||
| Aksaian | 490.7 * | |||||||||||
| Sakian | 492.2 * | |||||||||||
| Steptoean | 493 * | |||||||||||
| Paibian | 494 | |||||||||||
| Ensyan †/Maduan/Nganasanian | 494.7 * | |||||||||||
| Miaolingian | Guzhangian | Cambrian 4 | Marjumian | Albertian † | Ayusokkanian | 497 | ||||||
| Arcadian | 498.4 | |||||||||||
| Mayan/Menevian | 499.5 | |||||||||||
| Drumian | 500.5 | |||||||||||
| Wuliuan | Cambrian 3 | Topazan | Amgan/Solvan | 504.5 | ||||||||
| Delamaran | 506.5 | |||||||||||
| Series 2 | Stage 4 | Waucoban † | Branchian | 509 | ||||||||
| Toyonian | Lenian † | 510 * | ||||||||||
| Dyeran | 511 * | |||||||||||
| Botomian | 512.5 * | |||||||||||
| Stage 3 | Cambrian 2 | 514 | ||||||||||
| Montezuman | 514.8 * | |||||||||||
| Atdabanian | 515.6 * | |||||||||||
| Placentian | 517.1 | |||||||||||
| Begadean | 519.9 * | |||||||||||
| Terreneuvian | Stage 2 | Tommotian | 521 | |||||||||
| Nemakit-Daldynian | 525.5 | |||||||||||
| Fortunian | Cambrian 1 | Manykaian † | 529 | |||||||||
| 538.8 | ||||||||||||