635 - 571.7 Ma

The definition of this interval in the timescale Obsolete Precambrian Ages 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

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 1 timescales which overlap this one. show

• Obsolete Precambrian Ages: Vendian age

This interval is no longer in current use

This interval is used in the definition of 29 collections

A total of 371 collections with 1607 occurrences lie within this time span