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
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
- M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 view
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
- J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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
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 126164 collections
International Chronostratigraphic Timescale | Ordovician of North America | Ordovician of the Baltic | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Cincinnatian | Gamachian | Harju | Porkuni | 443.8 | ||||||||||
Katian | Pirgu | 445.2 | |||||||||||||||
Richmondian | 446 * | ||||||||||||||||
Vormsi | 449.6 * | ||||||||||||||||
Maysvillian | Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian | 449.8 * | |||||||||||||||
Nabala | Johvi † | 450 * | |||||||||||||||
Edenian | 450.4 * | ||||||||||||||||
Viru | Rakvere | 450.6 * | |||||||||||||||
Mohawkian | Chatfieldian | 451.1 * | |||||||||||||||
Oandu | 452 * | ||||||||||||||||
Sandbian | Keila | Idavere † | 453 | ||||||||||||||
Turinian | 453.7 * | ||||||||||||||||
Haljala | 453.9 | ||||||||||||||||
Kukruse | 456.4 * | ||||||||||||||||
Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | ||||||||||||||
Uhaku | Aluoja † | 457.5 * | |||||||||||||||
Middle Ordovician | Darriwilian | 458.4 | |||||||||||||||
Lasnamagi | 458.9 * | ||||||||||||||||
Aseri | 460.4 * | ||||||||||||||||
Oeland | Kunda | 462.9 * | |||||||||||||||
Valaste †/Hunderum | 464.3 * | ||||||||||||||||
Volkhov | Langevoja †/Vaana/Saka | 467.1 * | |||||||||||||||
Dapingian | 467.3 | ||||||||||||||||
Rangerian | 469.1 * | ||||||||||||||||
Billingen | 469.3 * | ||||||||||||||||
Early Ordovician | Floian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | |||||||||||
Latorp † | 470.1 * | ||||||||||||||||
Hunneberg | 473.7 * | ||||||||||||||||
Tulean | 473.9 * | ||||||||||||||||
Tremadocian | 477.7 | ||||||||||||||||
Stairsian | 480.3 * | ||||||||||||||||
Varangu | 481.3 * | ||||||||||||||||
Skullrockian/Demingian | 482 * | ||||||||||||||||
Pakerort | 482.2 * | ||||||||||||||||
485.4 * | |||||||||||||||||
486.3 | |||||||||||||||||
486.5 | |||||||||||||||||
487.5 |