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 128152 collections
| International Chronostratigraphic Timescale | Cambrian of Australia | Cambrian of Britain | Ordovician of China | Cambrian of Kazakhstan | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Hirnantian | Xiaoxita †/Shikou | Wufeng † | 443.8 | ||||
| Katian | Chientangkiangian | 445.2 | ||||||||
| Neichianshanian/Hanjiang | 449.5 | |||||||||
| Sandbian | 453 | |||||||||
| Middle Ordovician | Darriwilian | Darriwilian | Guniu †/Hulo | 458.4 | ||||||
| Hunjiang † | Dawan †/Daobaowan/Ningkuo | 466.3 * | ||||||||
| Dapingian | Dapingian | 467.3 | ||||||||
| Early Ordovician | Floian | Yiyangian | 470 | |||||||
| Tremadocian | Xinchangian | Ungurian | 477.7 | |||||||
| Lianghekou † | 477.9 * | |||||||||
| Cambrian | Furongian | Stage 10 | Datsonian | Merioneth | Dolgellian/Trempealeauan | Batyrbaian | 485.4 | |||
| Payntonian | 486.8 * | |||||||||
| Festiniogian | 489.2 * | |||||||||
| Jiangshanian | Iverian | 489.5 | ||||||||
| Aksaian | 490.7 * | |||||||||
| Sakian | 492.2 * | |||||||||
| Maentwrogian | 493.1 * | |||||||||
| Paibian | Idamean | 494 | ||||||||
| Miaolingian | Guzhangian | Mindyallan | St Davids | Ayusokkanian | 497 | |||||
| Boomerangian | 499 | |||||||||
| 499.5 | ||||||||||
| Drumian | Undillan | Zhanaarykian | 500.5 | |||||||
| Floran | Tuesaian | 503 | ||||||||
| Wuliuan | Templetonian | 504.5 | ||||||||
| 505.3 | ||||||||||
| Ordian | 507.8 * | |||||||||
| Series 2 | Stage 4 | Caerfai | 509 | |||||||
| Toyonian | 510 * | |||||||||
| 510.8 * | ||||||||||
| Botomian | 512.5 * | |||||||||
| Stage 3 | 514 | |||||||||
| Atdabanian | 515.6 * | |||||||||
| Terreneuvian | Stage 2 | Tommotian | 521 | |||||||
| 525.5 | ||||||||||
| Fortunian | 529 | |||||||||
| 538.8 | ||||||||||