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
- 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
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 | Ten Million Year Bins | Ordovician of Ibero-Bohemia | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Ordovician 5 | Kosovian | 443.8 | ||||||
| Katian | Kralodvorian | Bohdalec † | 445.2 | ||||||||
| Berounian | 449.7 * | ||||||||||
| Sandbian | Ordovician 4 | 453 | |||||||||
| Zahorany †/Vinice | Letna † | 456.2 * | |||||||||
| Liben † | 458 * | ||||||||||
| Middle Ordovician | Darriwilian | Ordovician 3 | 458.4 | ||||||||
| Dobrotivian | 458.5 * | ||||||||||
| Oretanian | 459.7 * | ||||||||||
| Sarka † | 461.7 * | ||||||||||
| Dapingian | Ordovician 2 | Klabava † | 467.3 | ||||||||
| Arenigian | 468 | ||||||||||
| Early Ordovician | Floian | 470 | |||||||||
| Tremadocian | Ordovician 1 | Tremadocian | 477.7 | ||||||||
| 485.4 | |||||||||||