482 - 480.3 Ma

The definition of this interval in the timescale Ordovician of North America is taken from the following source:

• F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view

The top and bottom ages have 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: Migneintian age, Tremadoc epoch, Cressagian age
• Ordovician of the Baltic: Latorp age, Oeland epoch, Hunneberg age, Varangu age
• Ordovician of Australia: Lancefieldian age
• Ordovician of China: Xinchangian age, Lianghekou age, Hunjiang age
• Ordovician of North America: Gasconadian age, Ibexian epoch, Cassinian age, Canadian age, Jeffersonian age
• Cambrian of Kazakhstan: Ungurian age

This interval is used in the definition of 113 collections

A total of 113 collections with 493 occurrences lie within this time span