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
- 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
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 126586 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 | |||||||||||