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
- 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
- Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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 | Cambrian of Siberia | Ordovician of Britain | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Ashgill | Hirnantian | 443.8 | |||||||
Katian | Rawtheyan | 445.2 | ||||||||||
Cautleyan | 448.9 * | |||||||||||
Pusgillian | 449.3 * | |||||||||||
Caradoc | Streffordian | Onnian † | 449.6 * | |||||||||
Cheneyan | 451.5 * | |||||||||||
Burrellian | 452.7 * | |||||||||||
Sandbian | 453 | |||||||||||
Actonian † | 453.2 * | |||||||||||
Marshbrookian † | Woolstonian † | 454.2 * | ||||||||||
Longvillian † | 455.2 * | |||||||||||
Aurelucian | 456.8 * | |||||||||||
Soudleyan †/Harnagian/Costonian | 457.4 * | |||||||||||
Middle Ordovician | Darriwilian | Llanvirn | Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn | 458.4 | ||||||||
Abereiddian/Early Llanvirn | 461.3 * | |||||||||||
Dapingian | 467.3 | |||||||||||
Arenig | Fennian | 468.4 * | ||||||||||
Early Ordovician | Floian | 470 | ||||||||||
Whitlandian | 471.1 * | |||||||||||
Moridunian | 474.3 * | |||||||||||
Tremadocian | Tremadoc | Migneintian | 477.7 | |||||||||
Cressagian | 480.8 * | |||||||||||
Mansian † | 483.55 * | |||||||||||
485 * | ||||||||||||
485.4 |