174.7 - 170.9 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. 2023. The ICS International Chronostratigraphic Chart v2023/09. view

There are intervals in 5 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Middle Jurassic epoch
• Mesozoic Subages: Late Aalenian subage, Middle Aalenian subage, Early Aalenian subage
• Ammonite Chrons of Northwest Europe: Concavum chron, Opalinum chron, Murchisonae chron
• Ammonite Chrons of North America: Howelli chron, Scissum chron, Westermanni chron
• Permian-Jurassic of New Zealand: Kawhia epoch, Temaikan age

This interval is used in the definition of 942 collections

A total of 1612 collections with 7420 occurrences lie within this time span