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
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
- F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 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
- 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
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 127017 collections
International Chronostratigraphic Timescale | Ordovician of Britain | Ordovician of North America | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Ashgill | Hirnantian | Cincinnatian | Gamachian | 443.8 | ||||||||||
Katian | Rawtheyan | 445.2 | |||||||||||||||
Richmondian | 446 * | ||||||||||||||||
Cautleyan | 448.9 * | ||||||||||||||||
Pusgillian | 449.3 * | ||||||||||||||||
Caradoc | Streffordian | Onnian † | 449.6 * | ||||||||||||||
Maysvillian | Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian | 449.8 * | |||||||||||||||
Edenian | 450.4 * | ||||||||||||||||
Mohawkian | Chatfieldian | 451.1 * | |||||||||||||||
Cheneyan | 451.5 * | ||||||||||||||||
Burrellian | 452.7 * | ||||||||||||||||
Sandbian | 453 | ||||||||||||||||
Actonian † | 453.2 * | ||||||||||||||||
Turinian | 453.7 * | ||||||||||||||||
Marshbrookian † | Woolstonian † | 454.2 * | |||||||||||||||
Longvillian † | 455.2 * | ||||||||||||||||
Aurelucian | 456.8 * | ||||||||||||||||
Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | ||||||||||||||
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 * | |||||||||||||||
Rangerian | 469.1 * | ||||||||||||||||
Early Ordovician | Floian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | |||||||||||
Whitlandian | 471.1 * | ||||||||||||||||
Tulean | 473.9 * | ||||||||||||||||
Moridunian | 474.3 * | ||||||||||||||||
Tremadocian | Tremadoc | Migneintian | 477.7 | ||||||||||||||
Stairsian | 480.3 * | ||||||||||||||||
Cressagian | 480.8 * | ||||||||||||||||
Skullrockian/Demingian | 482 * | ||||||||||||||||
485 * | |||||||||||||||||
485.4 | |||||||||||||||||
487.5 |