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
- A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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 126701 collections
International Chronostratigraphic Timescale | Ordovician of Australia | Ten Million Year Bins | Ordovician of the Baltic | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Bolindian | Ordovician 5 | Harju | Porkuni | 443.8 | ||||||
Katian | Pirgu | 445.2 | |||||||||||
Eastonian | 449 * | ||||||||||||
Vormsi | 449.6 * | ||||||||||||
Nabala | Johvi † | 450 * | |||||||||||
Viru | Rakvere | 450.6 * | |||||||||||
Gisbornian | Oandu | 452 * | |||||||||||
Sandbian | Ordovician 4 | Keila | Idavere † | 453 | |||||||||
Haljala | 453.9 | ||||||||||||
Kukruse | 456.4 * | ||||||||||||
Uhaku | Aluoja † | 457.5 * | |||||||||||
Middle Ordovician | Darriwilian | Darriwilian | Ordovician 3 | 458.4 | |||||||||
Lasnamagi | 458.9 * | ||||||||||||
Aseri | 460.4 * | ||||||||||||
Oeland | Kunda | 462.9 * | |||||||||||
Valaste †/Hunderum | 464.3 * | ||||||||||||
Volkhov | Langevoja †/Vaana/Saka | 467.1 * | |||||||||||
Dapingian | Yapeenian | Ordovician 2 | 467.3 | ||||||||||
Castlemainian | 468.5 * | ||||||||||||
Billingen | 469.3 * | ||||||||||||
Early Ordovician | Floian | Chewtonian | 470 | ||||||||||
Latorp † | 470.1 * | ||||||||||||
Bendigonian | 471.8 * | ||||||||||||
Lancefieldian | 473.5 * | ||||||||||||
Hunneberg | 473.7 * | ||||||||||||
Tremadocian | Ordovician 1 | 477.7 | |||||||||||
Varangu | 481.3 * | ||||||||||||
Pakerort | 482.2 * | ||||||||||||
Warendian | 482.8 * | ||||||||||||
485.4 * | |||||||||||||
486.3 | |||||||||||||
486.5 |