485.4 - 483.55 Ma

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

• F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 7 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Early Ordovician epoch, Tremadocian age
• Ordovician of Britain: Cressagian age, Tremadoc epoch
• Ordovician of the Baltic: Latorp age, Oeland epoch, Pakerort age
• Ordovician of Australia: Warendian age
• Ordovician of China: Hunjiang age, Xinchangian age, Lianghekou age
• Ordovician of North America: Gasconadian age, Ibexian epoch, Canadian age, Demingian age, Skullrockian age, Jeffersonian age
• Cambrian of Kazakhstan: Ungurian age

This interval is no longer in current use

This interval is used in the definition of 11 collections

A total of 108 collections with 515 occurrences lie within this time span