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
- J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
- 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
- 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 126699 collections
| International Chronostratigraphic Timescale | Cambrian of Siberia | Ten Million Year Bins | Ordovician of North America | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Ordovician 5 | Cincinnatian | Gamachian | 443.8 | ||||||||
| Katian | 445.2 | |||||||||||||
| Richmondian | 446 * | |||||||||||||
| Maysvillian | Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian | 449.8 * | ||||||||||||
| Edenian | 450.4 * | |||||||||||||
| Mohawkian | Chatfieldian | 451.1 * | ||||||||||||
| Sandbian | Ordovician 4 | 453 | ||||||||||||
| Turinian | 453.7 * | |||||||||||||
| Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | |||||||||||
| Middle Ordovician | Darriwilian | Ordovician 3 | 458.4 | |||||||||||
| Dapingian | Ordovician 2 | 467.3 | ||||||||||||
| Rangerian | 469.1 * | |||||||||||||
| Early Ordovician | Floian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | ||||||||
| Tulean | 473.9 * | |||||||||||||
| Tremadocian | Ordovician 1 | 477.7 | ||||||||||||
| Stairsian | 480.3 * | |||||||||||||
| Skullrockian/Demingian | 482 * | |||||||||||||
| Mansian † | 483.55 * | |||||||||||||
| 485.4 | ||||||||||||||
| 487.5 | ||||||||||||||