Cambrian of North America
The interval definitions in this timescale are derived from the following sources:
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
There are 12 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 1827 collections
| International Chronostratigraphic Timescale | Cambrian of North America | Cambrian of West Avalonia | Cambrian Epochs | ||||
|---|---|---|---|---|---|---|---|
| Cambrian | Furongian | Stage 10 | Franconian †/Dresbachian/Millardan | Late Cambrian | 485.4 | ||
| Sunwaptan | 487.5 | ||||||
| Jiangshanian | 489.5 | ||||||
| Steptoean | 493 * | ||||||
| Paibian | 494 | ||||||
| Miaolingian | Guzhangian | Marjumian | Albertian † | Middle Cambrian | 497 | ||
| Arcadian | 498.4 | ||||||
| Drumian | 500.5 | ||||||
| Wuliuan | Topazan | 504.5 | |||||
| Delamaran | 506.5 | ||||||
| Series 2 | Stage 4 | Waucoban † | Branchian | Early Cambrian | 509 | ||
| Dyeran | 511 * | ||||||
| Stage 3 | 514 | ||||||
| Montezuman | 514.8 * | ||||||
| Placentian | 517.1 | ||||||
| Begadean | 519.9 * | ||||||
| Terreneuvian | Stage 2 | 521 | |||||
| Fortunian | 529 | ||||||
| 538.8 | |||||||