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
- M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
- J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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.
This timescale is used in the definition of 126679 collections
| International Chronostratigraphic Timescale | Ten Million Year Bins | Mesozoic Subages | |||||
|---|---|---|---|---|---|---|---|
| Cretaceous | Late Cretaceous | Maastrichtian | Cretaceous 8 | Late Maastrichtian/Early Maastrichtian | 66 | ||
| Campanian | Cretaceous 7 | Late Campanian/Middle Campanian/Early Campanian | 72.1 | ||||
| Santonian | Cretaceous 6 | Late Santonian/Middle Santonian/Early Santonian | 83.6 | ||||
| Coniacian | Late Coniacian/Middle Coniacian/Early Coniacian | 86.3 | |||||
| Turonian | Late Turonian/Middle Turonian/Early Turonian | 89.8 | |||||
| Cenomanian | Cretaceous 5 | Late Cenomanian/Middle Cenomanian/Early Cenomanian | 93.9 | ||||
| Early Cretaceous | Albian | Cretaceous 4 | Late Albian | 100.5 | |||
| Middle Albian | 106.2 * | ||||||
| Early Albian | 109.9 * | ||||||
| Aptian | Cretaceous 3 | Late Aptian | 113 | ||||
| Early Aptian | 119.5 * | ||||||
| Barremian | Cretaceous 2 | Late Barremian/Early Barremian | 121.4 | ||||
| Hauterivian | Late Hauterivian/Early Hauterivian | 125.77 | |||||
| Valanginian | Cretaceous 1 | Late Valanginian/Early Valanginian | 132.6 | ||||
| Berriasian | Late Berriasian | 139.8 | |||||
| Middle Berriasian | 140.6 * | ||||||
| Early Berriasian | 142.7 * | ||||||
| 145 | |||||||