468 - 461 Ma

The definition of this interval in the timescale Ordovician of Ibero-Bohemia 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 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 6 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Darriwilian age, Middle Ordovician epoch
• Ordovician of Britain: Early Llandeilo age, Early Llanvirn age, Late Llanvirn age, Middle Llandeilo age, Abereiddian age, Late Llandeilo age, Llandeilian age, Llanvirn epoch, Llandeilo age
• Ordovician of the Baltic: Valaste age, Hunderum age, Aluoja age, Lasnamagi age, Oeland epoch, Aseri age, Kunda age, Viru epoch
• Ordovician of Ibero-Bohemia: Sarka age, Letna age, Liben age
• Ordovician of China: Ningkuo age, Hunjiang age, Hulo age, Guniu age, Dawan age, Daobaowan age
• Ordovician of North America: Chazyan age, Canadian age, Marmor age, Whiterockian epoch

This interval is used in the definition of 48 collections

A total of 2469 collections with 13554 occurrences lie within this time span