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
- 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 126762 collections
| International Chronostratigraphic Timescale | Ordovician of Ibero-Bohemia | ||||||
|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Kosovian | 443.8 | |||
| Katian | Kralodvorian | Bohdalec † | 445.2 | ||||
| Berounian | 449.7 * | ||||||
| Sandbian | 453 | ||||||
| Zahorany †/Vinice | Letna † | 456.2 * | |||||
| Liben † | 458 * | ||||||
| Middle Ordovician | Darriwilian | 458.4 | |||||
| Dobrotivian | 458.5 * | ||||||
| Oretanian | 459.7 * | ||||||
| Sarka † | 461.7 * | ||||||
| Dapingian | Klabava † | 467.3 | |||||
| Arenigian | 468 | ||||||
| Early Ordovician | Floian | 470 | |||||
| Tremadocian | Tremadocian | 477.7 | |||||
| 485.4 | |||||||