419.2 - 410.8 Ma

The definition of this interval in the timescale Devonian of France is taken from the following source:

• W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view

There are intervals in 3 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Lochkovian age, Early Devonian epoch
• Devonian Subages: Early Lochkovian subage, Middle Lochkovian subage, Late Lochkovian subage
• Devonian of Eastern North America: Helderbergian age

This interval is used in the definition of 50 collections

A total of 1502 collections with 10860 occurrences lie within this time span