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
- D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126150 collections
International Chronostratigraphic Timescale | Ordovician of Britain | Cambrian of Kazakhstan | Cambrian of Siberia | Ordovician of Ibero-Bohemia | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Ashgill | Hirnantian | Kosovian | 443.8 | ||||||||||
Katian | Rawtheyan | Kralodvorian | Bohdalec † | 445.2 | ||||||||||||
Cautleyan | 448.9 * | |||||||||||||||
Pusgillian | 449.3 * | |||||||||||||||
Caradoc | Streffordian | Onnian † | 449.6 * | |||||||||||||
Berounian | 449.7 * | |||||||||||||||
Cheneyan | 451.5 * | |||||||||||||||
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 | 458.4 | ||||||||||||
Dobrotivian | 458.5 * | |||||||||||||||
Oretanian | 459.7 * | |||||||||||||||
Abereiddian/Early Llanvirn | 461.3 * | |||||||||||||||
Sarka † | 461.7 * | |||||||||||||||
Dapingian | Klabava † | 467.3 | ||||||||||||||
Arenigian | 468 | |||||||||||||||
Arenig | Fennian | 468.4 * | ||||||||||||||
Early Ordovician | Floian | 470 | ||||||||||||||
Whitlandian | 471.1 * | |||||||||||||||
Moridunian | 474.3 * | |||||||||||||||
Tremadocian | Tremadoc | Migneintian | Ungurian | Tremadocian | 477.7 | |||||||||||
Cressagian | 480.8 * | |||||||||||||||
Mansian † | 483.55 * | |||||||||||||||
485 * | ||||||||||||||||
485.4 |