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, 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
- F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
- J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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 126689 collections
| International Chronostratigraphic Timescale | Ten Million Year Bins | Mesozoic Subages | |||||
|---|---|---|---|---|---|---|---|
| Triassic | Late Triassic | Rhaetian | Triassic 4 | 201.4 | |||
| Norian | Sevatian | 208.5 | |||||
| Alaunian | 213.2 * | ||||||
| Lacian | 216.7 * | ||||||
| Carnian | Triassic 3 | Tuvalian | 227 | ||||
| Julian | 233.4 * | ||||||
| Middle Triassic | Ladinian | Triassic 2 | Longobardian | 237 | |||
| Fassanian | 239.7 * | ||||||
| Anisian | Illyrian | 242 | |||||
| Pelsonian | 243.8 * | ||||||
| Bithynian | 244.7 * | ||||||
| Aegean | 245.5 * | ||||||
| Early Triassic | Olenekian | Triassic 1 | Spathian | 247.2 | |||
| Smithian | 248.9 * | ||||||
| Induan | Dienerian | 251.2 | |||||
| Griesbachian | 251.4 * | ||||||
| 251.902 | |||||||