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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
- M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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
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 126764 collections
| International Chronostratigraphic Timescale | Silurian of the Baltic | Ordovician of North America | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Silurian | Pridoli | Ohesaare | 419.2 | |||||||
| Kaugetuma | 421.7 * | |||||||||
| Ludlow | Ludfordian | Kuressaare | 423 | |||||||
| Paadla | 423.4 * | |||||||||
| Gorstian | 425.6 | |||||||||
| Wenlock | Homerian | Rootsikula | 427.4 | |||||||
| Jaagarahu | 429.2 * | |||||||||
| Sheinwoodian | 430.5 | |||||||||
| Jaani | 431.8 * | |||||||||
| Llandovery | Telychian | 433.4 | ||||||||
| Adavere | 434 * | |||||||||
| Aeronian | 438.5 | |||||||||
| Raikkula | 439.4 * | |||||||||
| Rhuddanian | 440.8 | |||||||||
| Juuru | 441.4 * | |||||||||
| Ordovician | Late Ordovician | Hirnantian | Cincinnatian | Gamachian | 443.8 | |||||
| Katian | 445.2 | |||||||||
| Richmondian | 446 * | |||||||||
| Maysvillian | Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian | 449.8 * | ||||||||
| Edenian | 450.4 * | |||||||||
| Mohawkian | Chatfieldian | 451.1 * | ||||||||
| Sandbian | 453 | |||||||||
| Turinian | 453.7 * | |||||||||
| Whiterockian | Canadian † | Chazyan †/Marmor | 457 * | |||||||
| Middle Ordovician | Darriwilian | 458.4 | ||||||||
| Dapingian | 467.3 | |||||||||
| Rangerian | 469.1 * | |||||||||
| Early Ordovician | Floian | Ibexian | Blackhillsian | Jeffersonian † | Cassinian † | 470 | ||||
| Tulean | 473.9 * | |||||||||
| Tremadocian | 477.7 | |||||||||
| Stairsian | 480.3 * | |||||||||
| Skullrockian | Demingian † | 482 * | ||||||||
| Cambrian | Furongian | Stage 10 | 485.4 | |||||||
| 487.5 | ||||||||||