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
- M. Freudenthal. 2006. Mammal Paleogene zones. personal communication view
- J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) 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
- P. L. Gibbard, M. J. Head, and M. J. C. Walker. 2010. Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma. Journal of Quaternary Science 25(2):96-102 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 126152 collections
International Chronostratigraphic Timescale | Ordovician of Britain | 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 | Tremadocian | 477.7 | |||||||||||||
Cressagian | 480.8 * | ||||||||||||||||
485 * | |||||||||||||||||
485.4 |