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
- 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 126778 collections
| International Chronostratigraphic Timescale | Permian of North America | Silurian of England | Ordovician of Ibero-Bohemia | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Permian | Guadalupian | Capitanian | Capitanian | 259.51 | |||||||
| Wordian | Wordian | 264.28 | |||||||||
| Roadian | Roadian | 266.9 | |||||||||
| Cisuralian | Kungurian | Leonardian | Cathedralian | 273.01 | |||||||
| Hessian | 281.9 * | ||||||||||
| Artinskian | 283.5 | ||||||||||
| Wolfcampian | Lenoxian | 286.1 * | |||||||||
| Sakmarian | 290.1 | ||||||||||
| Asselian | Nealian | 293.52 | |||||||||
| Carboniferous | Pennsylvanian | Gzhelian | 298.9 | ||||||||
| Kasimovian | 303.7 | ||||||||||
| Moscovian | 307 | ||||||||||
| Bashkirian | 315.2 | ||||||||||
| Mississippian | Serpukhovian | 323.2 | |||||||||
| Visean | 330.9 | ||||||||||
| Tournaisian | 346.7 | ||||||||||
| Devonian | Late Devonian | Famennian | 358.9 | ||||||||
| Frasnian | 372.2 | ||||||||||
| Middle Devonian | Givetian | 382.7 | |||||||||
| Eifelian | 387.7 | ||||||||||
| Early Devonian | Emsian | 393.3 | |||||||||
| Pragian | 407.6 | ||||||||||
| Lochkovian | 410.8 | ||||||||||
| 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 | |||||||||||