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
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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
- D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. view
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
- A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 view
- J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) view
- M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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 126650 collections
| International Chronostratigraphic Timescale | Ordovician of China | Cambrian of Siberia | Ordovician of North America | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Hirnantian | Xiaoxita †/Shikou | Wufeng † | Cincinnatian | Gamachian | 443.8 | ||||||||||
| Katian | Chientangkiangian | 445.2 | ||||||||||||||||
| Richmondian | 446 * | |||||||||||||||||
| Neichianshanian/Hanjiang | 449.5 | |||||||||||||||||
| Maysvillian | Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian | 449.8 * | ||||||||||||||||
| Edenian | 450.4 * | |||||||||||||||||
| Mohawkian | Chatfieldian | 451.1 * | ||||||||||||||||
| Sandbian | 453 | |||||||||||||||||
| Turinian | 453.7 * | |||||||||||||||||
| Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | |||||||||||||||
| Middle Ordovician | Darriwilian | Darriwilian | Guniu †/Hulo | 458.4 | ||||||||||||||
| Hunjiang † | Dawan †/Daobaowan/Ningkuo | 466.3 * | ||||||||||||||||
| Dapingian | Dapingian | 467.3 | ||||||||||||||||
| Rangerian | 469.1 * | |||||||||||||||||
| Early Ordovician | Floian | Yiyangian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | |||||||||||
| Tulean | 473.9 * | |||||||||||||||||
| Tremadocian | Xinchangian | 477.7 | ||||||||||||||||
| Lianghekou † | 477.9 * | |||||||||||||||||
| Stairsian | 480.3 * | |||||||||||||||||
| Skullrockian/Demingian | 482 * | |||||||||||||||||
| Mansian † | 483.55 * | |||||||||||||||||
| 485.4 | ||||||||||||||||||
| 487.5 | ||||||||||||||||||