440.5 - 438.6 Ma

The definition of this interval in the timescale International Chronostratigraphic Timescale is taken from the following source:

• K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2024. The ICS International Chronostratigraphic Chart v2024/12. International Commission on Stratigraphy view

There are intervals in 4 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Llandovery epoch
• Silurian of the Baltic: Raikkula age, Adavere age
• Silurian of England: Cowleigh Park age
• Silurian of North America: Clinton age, Ontarian age, Niagaran age, Medinan age, Alexandrian age

This interval is used in the definition of 1055 collections

A total of 622 collections with 3462 occurrences lie within this time span