538.8 - 506.5 Ma

The definition of this interval in the timescale Cambrian of North America 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

There are intervals in 8 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Fortunian age, Terreneuvian epoch, Stage 4 age, Stage 3 age, Stage 2 age, Series 2 epoch
• Cambrian Epochs: Early Cambrian epoch
• Cambrian of China: Meishucunian age, Duyunian age, Nangaoian age, Jinnigian age
• Cambrian of Australia: Templetonian age, Ordian age
• Cambrian of Siberia: Botomian age, Nemakit-Daldynian age, Toyonian age, Lenian age, Amgan age, Atdabanian age, Solvan age, Manykaian age, Tommotian age
• Cambrian of North America: Dyeran age, Delamaran age, Montezuman age, Begadean age
• Cambrian of West Avalonia: Placentian age, Branchian age
• Cambrian of Britain: Caerfai age

This interval is no longer in current use

This interval is used in the definition of 22 collections

A total of 3656 collections with 25053 occurrences lie within this time span