510 - 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 9 timescales which overlap this one. show

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

This interval is no longer in current use

This interval is used in the definition of 228 collections

A total of 923 collections with 5383 occurrences lie within this time span