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
- M. Freudenthal. 2006. Mammal Paleogene zones. personal communication view
- J. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
- Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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 127249 collections
| International Chronostratigraphic Timescale | Ammonite Chrons of Northwest Europe | Ten Million Year Bins | Ammonite Chrons of North America | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jurassic | Late Jurassic | Tithonian | Jurassic 6 | 145 | ||||||||||
| Kimmeridgian | Jurassic 5 | 149.2 | ||||||||||||
| Oxfordian | 154.8 | |||||||||||||
| Middle Jurassic | Callovian | 161.5 | ||||||||||||
| Bathonian | Jurassic 4 | 165.3 | ||||||||||||
| Bajocian | Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites | Epizigzagiceras | 168.2 | |||||||||||
| Humphresianum | Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense | 168.4 | ||||||||||||
| Aalenian | Concavum/Murchisonae/Opalinum | Jurassic 3 | Howelli/Scissum/Westermanni | 170.9 | ||||||||||
| Early Jurassic | Toarcian | Levesquei/Variabilis/Bifrons | Thouarsense | Yakounensis/Hillebrandti/Crassicosta | 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 | Jurassic 2 | 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 | Jurassic 1 | 192.9 | |||||||||||
| Pseudaetomoceras | Psiloceras | 196.4 * | ||||||||||||
| Franziceras/Euphyllites | 196.5 * | |||||||||||||
| Hettangian | Angulata/Liasicus/Planorbis | 199.5 | ||||||||||||
| 201.4 | ||||||||||||||