508.2 - 504.5 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 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 10 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Wuliuan age, Miaolingian epoch, Series 2 epoch, Stage 4 age
• Obsolete Names for ICS Units: Stage 5 age, Series 3 epoch
• Cambrian Epochs: Early Cambrian epoch, Middle Cambrian epoch
• Cambrian of China: Taijangian age, Duyunian age
• Cambrian of Australia: Ordian age, Templetonian age
• Cambrian of Siberia: Amgan age
• Cambrian of Kazakhstan: Tuesaian age
• Cambrian of North America: Delamaran age, Waucoban age, Albertian age, Topazan age
• Cambrian of West Avalonia: Arcadian age, Branchian age
• Cambrian of Britain: Caerfai age, St Davids age

This interval is no longer in current use

This interval is used in the definition of 228 collections

A total of 916 collections with 5421 occurrences lie within this time span