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
- 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 126762 collections
| International Chronostratigraphic Timescale | Cambrian of North America | Cambrian of Britain | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cambrian | Furongian | Stage 10 | Franconian †/Dresbachian/Millardan | Merioneth | Dolgellian/Trempealeauan | 485.4 | ||||
| Sunwaptan | 487.5 | |||||||||
| Festiniogian | 489.2 * | |||||||||
| Jiangshanian | 489.5 | |||||||||
| Steptoean | 493 * | |||||||||
| Maentwrogian | 493.1 * | |||||||||
| Paibian | 494 | |||||||||
| Miaolingian | Guzhangian | Marjumian | Albertian † | St Davids | 497 | |||||
| Drumian | 500.5 | |||||||||
| Wuliuan | Topazan | 504.5 | ||||||||
| Delamaran | 506.5 | |||||||||
| Series 2 | Stage 4 | Waucoban † | Caerfai | 509 | ||||||
| Dyeran | 511 * | |||||||||
| Stage 3 | 514 | |||||||||
| Montezuman | 514.8 * | |||||||||
| Begadean | 519.9 * | |||||||||
| Terreneuvian | Stage 2 | 521 | ||||||||
| Fortunian | 529 | |||||||||
| 538.8 | ||||||||||