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
- A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 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
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 126152 collections
International Chronostratigraphic Timescale | Ordovician of Britain | Ordovician of Australia | Ordovician of Ibero-Bohemia | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Ashgill | Hirnantian | Bolindian | Kosovian | 443.8 | ||||||||||
Katian | Rawtheyan | Kralodvorian | Bohdalec † | 445.2 | |||||||||||||
Cautleyan | 448.9 * | ||||||||||||||||
Eastonian | 449 * | ||||||||||||||||
Pusgillian | 449.3 * | ||||||||||||||||
Caradoc | Streffordian | Onnian † | 449.6 * | ||||||||||||||
Berounian | 449.7 * | ||||||||||||||||
Cheneyan | 451.5 * | ||||||||||||||||
Gisbornian | 452 * | ||||||||||||||||
Burrellian | 452.7 * | ||||||||||||||||
Sandbian | 453 | ||||||||||||||||
Actonian † | 453.2 * | ||||||||||||||||
Marshbrookian † | Woolstonian † | 454.2 * | |||||||||||||||
Longvillian † | 455.2 * | ||||||||||||||||
Zahorany †/Vinice | Letna † | 456.2 * | |||||||||||||||
Aurelucian | 456.8 * | ||||||||||||||||
Soudleyan †/Harnagian/Costonian | 457.4 * | ||||||||||||||||
Liben † | 458 * | ||||||||||||||||
Middle Ordovician | Darriwilian | Llanvirn | Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn | Darriwilian | 458.4 | ||||||||||||
Dobrotivian | 458.5 * | ||||||||||||||||
Oretanian | 459.7 * | ||||||||||||||||
Abereiddian/Early Llanvirn | 461.3 * | ||||||||||||||||
Sarka † | 461.7 * | ||||||||||||||||
Dapingian | Yapeenian | Klabava † | 467.3 | ||||||||||||||
Arenigian | 468 | ||||||||||||||||
Arenig | Fennian | 468.4 * | |||||||||||||||
Castlemainian | 468.5 * | ||||||||||||||||
Early Ordovician | Floian | Chewtonian | 470 | ||||||||||||||
Whitlandian | 471.1 * | ||||||||||||||||
Bendigonian | 471.8 * | ||||||||||||||||
Lancefieldian | 473.5 * | ||||||||||||||||
Moridunian | 474.3 * | ||||||||||||||||
Tremadocian | Tremadoc | Migneintian | Tremadocian | 477.7 | |||||||||||||
Cressagian | 480.8 * | ||||||||||||||||
Warendian | 482.8 * | ||||||||||||||||
485 * | |||||||||||||||||
485.4 |