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
- 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
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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 | Silurian of England | Ordovician of Ibero-Bohemia | |||||||
---|---|---|---|---|---|---|---|---|---|
Silurian | Pridoli | Red Downtonian/Temeside Shales/Downton Castle | Whitcliffe/Leintwardine | 419.2 | |||||
Bringewood/Elton | 421.3 | ||||||||
Ludlow | Ludfordian | Coalbrookdale | Wenlock (England)/Tickwood | 423 | |||||
Gorstian | 425.6 | ||||||||
Buildwas | 426.4 * | ||||||||
Wenlock | Homerian | 427.4 | |||||||
Wych | Woolhope | 428.4 * | |||||||
Sheinwoodian | 430.5 | ||||||||
Llandovery | Telychian | 433.4 | |||||||
436.3 * | |||||||||
Aeronian | 438.5 | ||||||||
Cowleigh Park | 439.3 * | ||||||||
Rhuddanian | 440.8 | ||||||||
Ordovician | Late Ordovician | Hirnantian | Kosovian | 443.8 | |||||
Katian | Kralodvorian | Bohdalec † | 445.2 | ||||||
Berounian | 449.7 * | ||||||||
Sandbian | 453 | ||||||||
Zahorany †/Vinice | Letna † | 456.2 * | |||||||
Liben † | 458 * | ||||||||
Middle Ordovician | Darriwilian | 458.4 | |||||||
Dobrotivian | 458.5 * | ||||||||
Oretanian | 459.7 * | ||||||||
Sarka † | 461.7 * | ||||||||
Dapingian | Klabava † | 467.3 | |||||||
Arenigian | 468 | ||||||||
Early Ordovician | Floian | 470 | |||||||
Tremadocian | Tremadocian | 477.7 | |||||||
485.4 |