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. 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
- F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
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 | Ammonite Chrons of Northwest Europe | Mesozoic Subages | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Jurassic | Late Jurassic | Tithonian | Late Tithonian | Middle Tithonian | 145 | ||||
| Early Tithonian | 146.3 * | ||||||||
| Kimmeridgian | Late Kimmeridgian | 149.2 | |||||||
| Early Kimmeridgian | 152.2 * | ||||||||
| Oxfordian | Late Oxfordian | Middle Oxfordian/Early Oxfordian | 154.8 | ||||||
| 157.9 * | |||||||||
| Middle Jurassic | Callovian | Late Callovian/Middle Callovian/Early Callovian | 161.5 | ||||||
| Bathonian | Late Bathonian/Middle Bathonian/Early Bathonian | 165.3 | |||||||
| Bajocian | Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites | Late Bajocian | 168.2 | ||||||
| Humphresianum | 168.4 | ||||||||
| Early Bajocian | 168.6 * | ||||||||
| Aalenian | Concavum/Murchisonae/Opalinum | Late Aalenian/Middle Aalenian/Early Aalenian | 170.9 | ||||||
| Early Jurassic | Toarcian | Levesquei/Variabilis/Bifrons | Thouarsense | Late Toarcian | 174.7 | ||||
| 180.1 | |||||||||
| Middle Toarcian | 180.4 * | ||||||||
| Serpentinum/Falciferum/Tenuicostatum | 182 | ||||||||
| Early Toarcian | 182.9 * | ||||||||
| Pliensbachian | Spinatum/Margaritatus/Davoei/Ibex/Jamesoni | Late Pliensbachian/Early Pliensbachian | 184.2 | ||||||
| Sinemurian | Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi | Late Sinemurian/Early Sinemurian | 192.9 | ||||||
| Hettangian | Angulata/Liasicus/Planorbis | Late Hettangian/Middle Hettangian/Early Hettangian | 199.5 | ||||||
| 201.4 | |||||||||