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
- 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
- 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.
This timescale is used in the definition of 126562 collections
| International Chronostratigraphic Timescale | Devonian of Eastern North America | Devonian Subages | |||||
|---|---|---|---|---|---|---|---|
| Devonian | Late Devonian | Famennian | Conewangan/Conneautan/Canadaway | Late Famennian | 358.9 | ||
| Middle Famennian | 365.3 * | ||||||
| Early Famennian | 368.5 * | ||||||
| Frasnian | West Fallsian/Sonyean | Late Frasnian | 372.2 | ||||
| Middle Frasnian | 375.4 * | ||||||
| Early Frasnian | 379.3 * | ||||||
| Middle Devonian | Givetian | Geneseean/Taghanican/Tioughniogan | Cazenovian | Late Givetian | 382.7 | ||
| Middle Givetian | 383.7 * | ||||||
| Early Givetian | 385.9 * | ||||||
| Eifelian | Southwoodian | Late Eifelian | 387.7 | ||||
| Early Eifelian | 390.3 * | ||||||
| Early Devonian | Emsian | Sawkillian/Deer Parkian | Helderbergian | Late Emsian | 393.3 | ||
| Early Emsian | 398.3 * | ||||||
| Pragian | Pragian | 407.6 | |||||
| Lochkovian | Late Lochkovian | 410.8 | |||||
| Middle Lochkovian | 412.8 * | ||||||
| Early Lochkovian | 415.6 * | ||||||
| 419.2 | |||||||