199.5 - 192.9 Ma

The definition of this interval in the timescale Ammonite Chrons of Northwest Europe is taken from the following source:

• J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view

There are intervals in 6 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Sinemurian age, Early Jurassic epoch
• Mesozoic Subages: Early Sinemurian subage, Late Sinemurian subage
• Ammonite Chrons of Northwest Europe: Bucklandi chron, Raricostatum chron, Semicostatum chron, Turneri chron, Oxynotum chron
• Ammonite Chrons of North America: Pseudaetomoceras chron, Arnioceras arnouldi chron, Euphyllites chron, Asteroceras varians chron, Psiloceras chron, Plesechioceras harbledownense chron, Canadensis chron, Coroniceras chron, Franziceras chron
• Calcareous Nannoplankton Zones: NJ2b zone, NJ2 zone, NJ3 zone, NJ2a zone
• Permian-Jurassic of New Zealand: Aratauran age, Herangi epoch

This interval is used in the definition of 70 collections

A total of 2294 collections with 12619 occurrences lie within this time span