516 - 508.2 Ma

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

• 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

The top 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 8 timescales which overlap this one. show

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

This interval is no longer in current use

This interval is used in the definition of 119 collections

A total of 1147 collections with 7888 occurrences lie within this time span