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
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126778 collections
| International Chronostratigraphic Timescale | Ordovician of the Baltic | Carboniferous of China | Cambrian of North America | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Carboniferous | Pennsylvanian | Gzhelian | Xiaodushanian | 300 * | ||||||
| Kasimovian | 303.7 | |||||||||
| Dalaun | 305.8 * | |||||||||
| Moscovian | 307 | |||||||||
| Bashkirian | 315.2 | |||||||||
| Huashibanian | 318.5 * | |||||||||
| Lousuan | 321.2 * | |||||||||
| Mississippian | Serpukhovian | Dewunian | 323.2 | |||||||
| Shangsian | 330.8 * | |||||||||
| Visean | 330.9 | |||||||||
| Jiusian | 335 * | |||||||||
| Tournaisian | Tangbagouan | 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 | 419.2 | ||||||||
| Ludlow | Ludfordian | 423 | ||||||||
| Gorstian | 425.6 | |||||||||
| Wenlock | Homerian | 427.4 | ||||||||
| Sheinwoodian | 430.5 | |||||||||
| Llandovery | Telychian | 433.4 | ||||||||
| Aeronian | 438.5 | |||||||||
| Rhuddanian | 440.8 | |||||||||
| Ordovician | Late Ordovician | Hirnantian | Harju | Porkuni | 443.8 | |||||
| Katian | Pirgu | 445.2 | ||||||||
| Vormsi | 449.6 * | |||||||||
| Nabala | Johvi † | 450 * | ||||||||
| Viru | Rakvere | 450.6 * | ||||||||
| Oandu | 452 * | |||||||||
| Sandbian | Keila | Idavere † | 453 | |||||||
| Haljala | 453.9 | |||||||||
| Kukruse | 456.4 * | |||||||||
| Uhaku | Aluoja † | 457.5 * | ||||||||
| Middle Ordovician | Darriwilian | 458.4 | ||||||||
| Lasnamagi | 458.9 * | |||||||||
| Aseri | 460.4 * | |||||||||
| Oeland | Kunda | 462.9 * | ||||||||
| Valaste †/Hunderum | 464.3 * | |||||||||
| Volkhov | Langevoja †/Vaana/Saka | 467.1 * | ||||||||
| Dapingian | 467.3 | |||||||||
| Billingen | 469.3 * | |||||||||
| Early Ordovician | Floian | 470 | ||||||||
| Latorp † | 470.1 * | |||||||||
| Hunneberg | 473.7 * | |||||||||
| Tremadocian | 477.7 | |||||||||
| Varangu | 481.3 * | |||||||||
| Pakerort | 482.2 * | |||||||||
| Cambrian | Furongian | Stage 10 | Franconian †/Dresbachian/Millardan | 485.4 | ||||||
| 486.3 * | ||||||||||
| 486.5 | ||||||||||
| Sunwaptan | 487.5 | |||||||||
| Jiangshanian | 489.5 | |||||||||
| Steptoean | 493 * | |||||||||
| Paibian | 494 | |||||||||
| Miaolingian | Guzhangian | Marjumian | Albertian † | 497 | ||||||
| Drumian | 500.5 | |||||||||
| Wuliuan | Topazan | 504.5 | ||||||||
| Delamaran | 506.5 | |||||||||
| Series 2 | Stage 4 | Waucoban † | 509 | |||||||
| Dyeran | 511 * | |||||||||
| Stage 3 | 514 | |||||||||
| Montezuman | 514.8 * | |||||||||
| Begadean | 519.9 * | |||||||||
| Terreneuvian | Stage 2 | 521 | ||||||||
| Fortunian | 529 | |||||||||
| 538.8 | ||||||||||