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 127969 collections
| International Chronostratigraphic Timescale | Ordovician of China | Silurian of the Baltic | |||||
|---|---|---|---|---|---|---|---|
| Silurian | Pridoli | Ohesaare | 419.2 | ||||
| Kaugetuma | 421.7 * | ||||||
| Ludlow | Ludfordian | Kuressaare | 423 | ||||
| Paadla | 423.4 * | ||||||
| Gorstian | 425.6 | ||||||
| Wenlock | Homerian | Rootsikula | 427.4 | ||||
| Jaagarahu | 429.2 * | ||||||
| Sheinwoodian | 430.5 | ||||||
| Jaani | 431.8 * | ||||||
| Llandovery | Telychian | 433.4 | |||||
| Adavere | 434 * | ||||||
| Aeronian | 438.5 | ||||||
| Raikkula | 439.4 * | ||||||
| Rhuddanian | 440.8 | ||||||
| Juuru | 441.4 * | ||||||
| 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 | 477.7 | |||||
| Lianghekou † | 477.9 * | ||||||
| 485.4 | |||||||