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
- 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 126701 collections
| International Chronostratigraphic Timescale | Ammonite Chrons of North America | Ammonite Chrons of Northwest Europe | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jurassic | Late Jurassic | Tithonian | 145 | ||||||||
| Kimmeridgian | 149.2 | ||||||||||
| Oxfordian | 154.8 | ||||||||||
| Middle Jurassic | Callovian | 161.5 | |||||||||
| Bathonian | 165.3 | ||||||||||
| Bajocian | Epizigzagiceras | Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites | 168.2 | ||||||||
| Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense | Humphresianum | 168.4 | |||||||||
| Aalenian | Howelli/Scissum/Westermanni | Concavum/Murchisonae/Opalinum | 170.9 | ||||||||
| Early Jurassic | Toarcian | Yakounensis/Hillebrandti/Crassicosta | Levesquei/Variabilis/Bifrons | Thouarsense | 174.7 | ||||||
| Planulata | 179.3 * | ||||||||||
| Arnioceras arnouldi | 179.8 * | ||||||||||
| 180.1 | |||||||||||
| Kanense | 181.3 * | ||||||||||
| Serpentinum/Falciferum/Tenuicostatum | 182 | ||||||||||
| Carlottense | 182.3 * | ||||||||||
| Kunae | 183.5 * | ||||||||||
| Pliensbachian | Spinatum/Margaritatus/Davoei/Ibex/Jamesoni | 184.2 | |||||||||
| Freboldi | 185.1 * | ||||||||||
| Whiteavesi/Imlayi | Tetraspidoceras | 186.2 * | |||||||||
| 189.2 * | |||||||||||
| Plesechioceras harbledownense/Asteroceras varians/Coroniceras | Canadensis | 190.3 * | |||||||||
| Sinemurian | Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi | 192.9 | |||||||||
| Pseudaetomoceras | Psiloceras | 196.4 * | |||||||||
| Franziceras/Euphyllites | 196.5 * | ||||||||||
| Hettangian | Angulata/Liasicus/Planorbis | 199.5 | |||||||||
| 201.4 | |||||||||||