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
- 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
- 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 126162 collections
International Chronostratigraphic Timescale | Ordovician of Ibero-Bohemia | Ordovician of China | Ordovician of North America | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Kosovian | Hirnantian | Xiaoxita †/Shikou | Wufeng † | Cincinnatian | Gamachian | 443.8 | ||||||||||
Katian | Kralodvorian | Bohdalec † | Chientangkiangian | 445.2 | |||||||||||||||
Richmondian | 446 * | ||||||||||||||||||
Neichianshanian/Hanjiang | 449.5 | ||||||||||||||||||
Berounian | 449.7 * | ||||||||||||||||||
Maysvillian | Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian | 449.8 * | |||||||||||||||||
Edenian | 450.4 * | ||||||||||||||||||
Mohawkian | Chatfieldian | 451.1 * | |||||||||||||||||
Sandbian | 453 | ||||||||||||||||||
Turinian | 453.7 * | ||||||||||||||||||
Zahorany †/Vinice | Letna † | 456.2 * | |||||||||||||||||
Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | ||||||||||||||||
Liben † | 458 * | ||||||||||||||||||
Middle Ordovician | Darriwilian | Darriwilian | Guniu †/Hulo | 458.4 | |||||||||||||||
Dobrotivian | 458.5 * | ||||||||||||||||||
Oretanian | 459.7 * | ||||||||||||||||||
Sarka † | 461.7 * | ||||||||||||||||||
Hunjiang † | Dawan †/Daobaowan/Ningkuo | 466.3 * | |||||||||||||||||
Dapingian | Klabava † | Dapingian | 467.3 | ||||||||||||||||
Arenigian | 468 | ||||||||||||||||||
Rangerian | 469.1 * | ||||||||||||||||||
Early Ordovician | Floian | Yiyangian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | ||||||||||||
Tulean | 473.9 * | ||||||||||||||||||
Tremadocian | Tremadocian | Xinchangian | 477.7 | ||||||||||||||||
Lianghekou † | 477.9 * | ||||||||||||||||||
Stairsian | 480.3 * | ||||||||||||||||||
Skullrockian/Demingian | 482 * | ||||||||||||||||||
485.4 | |||||||||||||||||||
487.5 |