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

This interval is used in the definition of 545 collections

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