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
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
- F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
- J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
- A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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 127245 collections
International Chronostratigraphic Timescale | Ordovician of the Baltic | Ordovician of Britain | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Harju | Porkuni | Ashgill | Hirnantian | 443.8 | |||||||||
Katian | Pirgu | Rawtheyan | 445.2 | |||||||||||||
Cautleyan | 448.9 * | |||||||||||||||
Pusgillian | 449.3 * | |||||||||||||||
Vormsi | Caradoc | Streffordian | Onnian † | 449.6 * | ||||||||||||
Nabala | Johvi † | 450 * | ||||||||||||||
Viru | Rakvere | 450.6 * | ||||||||||||||
Cheneyan | 451.5 * | |||||||||||||||
Oandu | 452 * | |||||||||||||||
Burrellian | 452.7 * | |||||||||||||||
Sandbian | Keila | Idavere † | 453 | |||||||||||||
Actonian † | 453.2 * | |||||||||||||||
Haljala | 453.9 | |||||||||||||||
Marshbrookian † | Woolstonian † | 454.2 * | ||||||||||||||
Longvillian † | 455.2 * | |||||||||||||||
Kukruse | 456.4 * | |||||||||||||||
Aurelucian | 456.8 * | |||||||||||||||
Soudleyan †/Harnagian/Costonian | 457.4 * | |||||||||||||||
Uhaku | Aluoja † | 457.5 * | ||||||||||||||
Middle Ordovician | Darriwilian | Llanvirn | Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn | 458.4 | ||||||||||||
Lasnamagi | 458.9 * | |||||||||||||||
Aseri | 460.4 * | |||||||||||||||
Abereiddian/Early Llanvirn | 461.3 * | |||||||||||||||
Oeland | Kunda | 462.9 * | ||||||||||||||
Valaste †/Hunderum | 464.3 * | |||||||||||||||
Volkhov | Langevoja †/Vaana/Saka | 467.1 * | ||||||||||||||
Dapingian | 467.3 | |||||||||||||||
Arenig | Fennian | 468.4 * | ||||||||||||||
Billingen | 469.3 * | |||||||||||||||
Early Ordovician | Floian | 470 | ||||||||||||||
Latorp † | 470.1 * | |||||||||||||||
Whitlandian | 471.1 * | |||||||||||||||
Hunneberg | 473.7 * | |||||||||||||||
Moridunian | 474.3 * | |||||||||||||||
Tremadocian | Tremadoc | Migneintian | 477.7 | |||||||||||||
Cressagian | 480.8 * | |||||||||||||||
Varangu | 481.3 * | |||||||||||||||
Pakerort | 482.2 * | |||||||||||||||
485 * | ||||||||||||||||
485.4 * | ||||||||||||||||
486.3 | ||||||||||||||||
486.5 |