516.2 - 506.5 Ma

The definition of this interval in the timescale Cambrian of West Avalonia is taken from the following source:

• F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view

The bottom age has 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.

There are intervals in 7 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Series 2 epoch, Stage 4 age, Stage 3 age
• Cambrian Epochs: Early Cambrian epoch
• Cambrian of China: Nangaoian age, Duyunian age
• Cambrian of Australia: Ordian age, Templetonian age
• Cambrian of Siberia: Botomian age, Solvan age, Toyonian age, Lenian age, Amgan age, Atdabanian age
• Cambrian of North America: Montezuman age, Dyeran age, Delamaran age, Waucoban age
• Cambrian of Britain: Caerfai age

This interval is used in the definition of 35 collections

A total of 1557 collections with 10988 occurrences lie within this time span