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 the Pamirs | Silurian of the Baltic | Permian of North America | Obsolete Precambrian Ages | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | Paleozoic | Permian | Lopingian | Changhsingian | Dorashamian | 251.902 | |||||
| Wuchiapingian | Dzhulfian | 254.14 | |||||||||
| Guadalupian | Capitanian | Midian | Capitanian | 259.51 | |||||||
| Wordian | Wordian | 264.28 | |||||||||
| Murgabian | 266.2 * | ||||||||||
| Roadian | Roadian | 266.9 | |||||||||
| Cisuralian | Kungurian | Kubergandian | Leonardian | Cathedralian | 273.01 | ||||||
| Bolorian | 279.8 | ||||||||||
| Hessian | 281.9 * | ||||||||||
| Artinskian | 283.5 | ||||||||||
| Yakhtashian | 286 | ||||||||||
| Wolfcampian | Lenoxian | 286.1 * | |||||||||
| Sakmarian | Sakmarian | 290.1 | |||||||||
| Asselian | 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 | 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 | 443.8 | ||||||||
| Katian | 445.2 | ||||||||||
| Sandbian | 453 | ||||||||||
| Middle Ordovician | Darriwilian | 458.4 | |||||||||
| Dapingian | 467.3 | ||||||||||
| Early Ordovician | Floian | 470 | |||||||||
| Tremadocian | 477.7 | ||||||||||
| Cambrian | Furongian | Stage 10 | 485.4 | ||||||||
| Jiangshanian | 489.5 | ||||||||||
| Paibian | 494 | ||||||||||
| Miaolingian | Guzhangian | 497 | |||||||||
| Drumian | 500.5 | ||||||||||
| Wuliuan | 504.5 | ||||||||||
| Series 2 | Stage 4 | 509 | |||||||||
| Stage 3 | 514 | ||||||||||
| Terreneuvian | Stage 2 | 521 | |||||||||
| Fortunian | 529 | ||||||||||
| Proterozoic | Neoproterozoic | Ediacaran | Vendian † | Poundian † | 538.8 | ||||||
| Wonokan † | 571.7 * | ||||||||||
| 635 | |||||||||||