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
- A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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
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 127243 collections
| International Chronostratigraphic Timescale | Ordovician of Ibero-Bohemia | Ordovician of Britain | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Kosovian | Ashgill | Hirnantian | 443.8 | ||||||||
| Katian | Kralodvorian | Bohdalec † | Rawtheyan | 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 | Tremadocian | Tremadoc | Migneintian | 477.7 | ||||||||||
| Cressagian | 480.8 * | |||||||||||||
| 485 * | ||||||||||||||
| 485.4 | ||||||||||||||