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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
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 126848 collections
| International Chronostratigraphic Timescale | Silurian of North America | Silurian of England | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Silurian | Pridoli | Cayugan | Red Downtonian/Temeside Shales/Downton Castle | Whitcliffe/Leintwardine | 419.2 | |||||||
| Bringewood/Elton | 421.3 | |||||||||||
| Niagaran | 422.5 * | |||||||||||
| Ludlow | Ludfordian | Coalbrookdale | Wenlock (England)/Tickwood | 423 | ||||||||
| Gorstian | 425.6 | |||||||||||
| Buildwas | 426.4 * | |||||||||||
| Wenlock | Homerian | Lockportian | 427.4 | |||||||||
| Wych | Woolhope | 428.4 * | ||||||||||
| Sheinwoodian | 430.5 | |||||||||||
| Llandovery | Telychian | Ontarian | 433.4 | |||||||||
| 436.3 * | ||||||||||||
| Aeronian | 438.5 | |||||||||||
| Alexandrian | 438.7 * | |||||||||||
| Cowleigh Park | 439.3 * | |||||||||||
| Medinan | Clinton | 440.1 * | ||||||||||
| 440.7 * | ||||||||||||
| Rhuddanian | 440.8 | |||||||||||
| 443.8 | ||||||||||||