470 - 457 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 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: Middle Ordovician epoch, Late Ordovician epoch, Darriwilian age, Dapingian age, Sandbian age
• Ordovician of Britain: Arenig epoch, Early Llanvirn age, Abereiddian age, Soudleyan age, Harnagian age, Longvillian age, Llandeilo age, Fennian age, Early Llandeilo age, Llandeilian age, Late Llandeilo age, Caradoc epoch, Middle Llandeilo age, Late Llanvirn age, Woolstonian age, Costonian age, Llanvirn epoch, Aurelucian age
• Ordovician of the Baltic: Hunderum age, Oeland epoch, Lasnamagi age, Aseri age, Billingen age, Vaana age, Kukruse age, Langevoja age, Idavere age, Saka age, Viru epoch, Valaste age, Volkhov age, Aluoja age, Kunda age, Uhaku age
• Ordovician of Ibero-Bohemia: Klabava age, Bohdalec age, Dobrotivian age, Letna age, Vinice age, Oretanian age, Liben age, Berounian age, Sarka age, Arenigian age, Zahorany age
• Ordovician of Australia: Yapeenian age, Castlemainian age, Gisbornian age
• Ordovician of China: Xiaoxita age, Hulo age, Neichianshanian age, Hanjiang age, Shikou age, Hunjiang age, Ningkuo age, Guniu age, Daobaowan age, Dawan age
• Ordovician of North America: Marmor age, Chazyan age, Canadian age, Rangerian age

This interval is used in the definition of 545 collections

A total of 4083 collections with 23997 occurrences lie within this time span