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
- 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
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 | Ordovician of China | Ordovician of the Baltic | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Hirnantian | Xiaoxita †/Shikou | Wufeng † | Harju | Porkuni | 443.8 | ||
| Katian | Chientangkiangian | Pirgu | 445.2 | |||||||
| Neichianshanian/Hanjiang | 449.5 | |||||||||
| Vormsi | 449.6 * | |||||||||
| Nabala | Johvi † | 450 * | ||||||||
| Viru | Rakvere | 450.6 * | ||||||||
| Oandu | 452 * | |||||||||
| Sandbian | Keila | Idavere † | 453 | |||||||
| Haljala | 453.9 | |||||||||
| Kukruse | 456.4 * | |||||||||
| Uhaku | Aluoja † | 457.5 * | ||||||||
| Middle Ordovician | Darriwilian | Darriwilian | Guniu †/Hulo | 458.4 | ||||||
| Lasnamagi | 458.9 * | |||||||||
| Aseri | 460.4 * | |||||||||
| Oeland | Kunda | 462.9 * | ||||||||
| Valaste †/Hunderum | 464.3 * | |||||||||
| Hunjiang † | Dawan †/Daobaowan/Ningkuo | 466.3 * | ||||||||
| Volkhov | Langevoja †/Vaana/Saka | 467.1 * | ||||||||
| Dapingian | Dapingian | 467.3 | ||||||||
| Billingen | 469.3 * | |||||||||
| Early Ordovician | Floian | Yiyangian | 470 | |||||||
| Latorp † | 470.1 * | |||||||||
| Hunneberg | 473.7 * | |||||||||
| Tremadocian | Xinchangian | 477.7 | ||||||||
| Lianghekou † | 477.9 * | |||||||||
| Varangu | 481.3 * | |||||||||
| Pakerort | 482.2 * | |||||||||
| 485.4 * | ||||||||||
| 486.3 | ||||||||||
| 486.5 | ||||||||||