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. 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
- 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
- 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 127245 collections
International Chronostratigraphic Timescale | Ordovician of North America | Ordovician of Britain | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Cincinnatian | Gamachian | Ashgill | Hirnantian | 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 |