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
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126764 collections
| International Chronostratigraphic Timescale | Cambrian of Britain | Silurian of the Baltic | Carboniferous of North America | ||||
|---|---|---|---|---|---|---|---|
| Permian | Cisuralian | Asselian | Bursumian † | 293.52 | |||
| Carboniferous | Pennsylvanian | Gzhelian | Virgilian | 298.9 | |||
| Kasimovian | Missourian | 303.7 | |||||
| Desmoinesian | 305.9 * | ||||||
| Moscovian | 307 | ||||||
| Atokan | 312.7 * | ||||||
| Bashkirian | 315.2 | ||||||
| Morrowan | 318.4 * | ||||||
| Mississippian | Serpukhovian | Chesterian | 323.2 | ||||
| Visean | 330.9 | ||||||
| Meramecian | 335.8 * | ||||||
| Osagean | 343.1 * | ||||||
| Tournaisian | 346.7 | ||||||
| Kinderhookian | 351.9 * | ||||||
| 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 | Merioneth | Dolgellian/Trempealeauan | 485.4 | ||
| Festiniogian | 489.2 * | ||||||
| Jiangshanian | 489.5 | ||||||
| Maentwrogian | 493.1 * | ||||||
| Paibian | 494 | ||||||
| Miaolingian | Guzhangian | St Davids | 497 | ||||
| Drumian | 500.5 | ||||||
| Wuliuan | 504.5 | ||||||
| Series 2 | Stage 4 | Caerfai | 509 | ||||
| Stage 3 | 514 | ||||||
| Terreneuvian | Stage 2 | 521 | |||||
| Fortunian | 529 | ||||||
| 538.8 | |||||||