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
- J. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 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 126973 collections
| International Chronostratigraphic Timescale | Ten Million Year Bins | Ordovician of Australia | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Ordovician 5 | Bolindian | 443.8 | |||||
| Katian | 445.2 | |||||||||
| Eastonian | 449 * | |||||||||
| Gisbornian | 452 * | |||||||||
| Sandbian | Ordovician 4 | 453 | ||||||||
| Middle Ordovician | Darriwilian | Ordovician 3 | Darriwilian | 458.4 | ||||||
| Dapingian | Ordovician 2 | Yapeenian | 467.3 | |||||||
| Castlemainian | 468.5 * | |||||||||
| Early Ordovician | Floian | Chewtonian | 470 | |||||||
| Bendigonian | 471.8 * | |||||||||
| Lancefieldian | 473.5 * | |||||||||
| Tremadocian | Ordovician 1 | 477.7 | ||||||||
| Warendian | 482.8 * | |||||||||
| 485.4 | ||||||||||