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
- 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
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
- 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 North America | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | 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 | 453 | |||||||||||||
Turinian | 453.7 * | |||||||||||||
Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | |||||||||||
Middle Ordovician | Darriwilian | 458.4 | ||||||||||||
Dapingian | 467.3 | |||||||||||||
Rangerian | 469.1 * | |||||||||||||
Early Ordovician | Floian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | ||||||||
Tulean | 473.9 * | |||||||||||||
Tremadocian | 477.7 | |||||||||||||
Stairsian | 480.3 * | |||||||||||||
Skullrockian/Demingian | 482 * | |||||||||||||
485.4 | ||||||||||||||
487.5 |