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
- 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 126580 collections
International Chronostratigraphic Timescale | Ordovician of Australia | Ordovician of China | ||||||
---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Bolindian | Hirnantian | Xiaoxita †/Shikou | Wufeng † | 443.8 | |
Katian | Chientangkiangian | 445.2 | ||||||
Eastonian | 449 * | |||||||
Neichianshanian/Hanjiang | 449.5 | |||||||
Gisbornian | 452 * | |||||||
Sandbian | 453 | |||||||
Middle Ordovician | Darriwilian | Darriwilian | Darriwilian | Guniu †/Hulo | 458.4 | |||
Hunjiang † | Dawan †/Daobaowan/Ningkuo | 466.3 * | ||||||
Dapingian | Yapeenian | Dapingian | 467.3 | |||||
Castlemainian | 468.5 * | |||||||
Early Ordovician | Floian | Chewtonian | Yiyangian | 470 | ||||
Bendigonian | 471.8 * | |||||||
Lancefieldian | 473.5 * | |||||||
Tremadocian | Xinchangian | 477.7 | ||||||
Lianghekou † | 477.9 * | |||||||
Warendian | 482.8 * | |||||||
485.4 |