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
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 128152 collections
| International Chronostratigraphic Timescale | Permian of the Russian Platform | Obsolete Carboniferous Ages of China | Silurian of North America | Ordovician of China | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Permian | Lopingian | Wuchiapingian | Tatarian | Vyatkian | 256.8 * | |||||||
| Guadalupian | Capitanian | Severodvinian | 259.51 | |||||||||
| Wordian | Urzhumian | 264.28 | ||||||||||
| Roadian | Kazanian | Povolzhian | 266.9 | |||||||||
| Sokian | 270.7 * | |||||||||||
| Cisuralian | Kungurian | Kungurian | Irenian/Ufimian | 273.01 | ||||||||
| Filipovian | 276.5 * | |||||||||||
| Saraninian | 280.1 * | |||||||||||
| Artinskian | Artinskian | Sarginian | 283.5 | |||||||||
| Irginian | 285.9 * | |||||||||||
| Burtsevian | 287.8 * | |||||||||||
| Sakmarian | Sakmarian | Sterlitamakian | 290.1 | |||||||||
| Tastubian | 291.7 * | |||||||||||
| Asselian | Asselian | Shikhanian | 293.52 | |||||||||
| Uskalykian | 294.8 | |||||||||||
| Surenian | 297.5 | |||||||||||
| Carboniferous | Pennsylvanian | Gzhelian | Mapingian † | 298.9 | ||||||||
| Kasimovian | 303.7 | |||||||||||
| 305.9 | ||||||||||||
| 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 | Cayugan | 419.2 | |||||||||
| Niagaran | 422.5 * | |||||||||||
| Ludlow | Ludfordian | 423 | ||||||||||
| Gorstian | 425.6 | |||||||||||
| Wenlock | Homerian | Lockportian | 427.4 | |||||||||
| Sheinwoodian | 430.5 | |||||||||||
| Llandovery | Telychian | Ontarian | 433.4 | |||||||||
| Aeronian | 438.5 | |||||||||||
| Alexandrian | 438.7 * | |||||||||||
| Medinan | Clinton | 440.1 * | ||||||||||
| 440.7 * | ||||||||||||
| Rhuddanian | 440.8 | |||||||||||
| Ordovician | Late Ordovician | Hirnantian | Hirnantian | Xiaoxita †/Shikou | Wufeng † | 443.8 | ||||||
| Katian | Chientangkiangian | 445.2 | ||||||||||
| Neichianshanian/Hanjiang | 449.5 | |||||||||||
| Sandbian | 453 | |||||||||||
| Middle Ordovician | Darriwilian | Darriwilian | Guniu †/Hulo | 458.4 | ||||||||
| Hunjiang † | Dawan †/Daobaowan/Ningkuo | 466.3 * | ||||||||||
| Dapingian | Dapingian | 467.3 | ||||||||||
| Early Ordovician | Floian | Yiyangian | 470 | |||||||||
| Tremadocian | Xinchangian | 477.7 | ||||||||||
| Lianghekou † | 477.9 * | |||||||||||
| 485.4 | ||||||||||||