The Dinosauria

Anchiceratops, Used with permission from John Sibbick 

  • The great Permian extinction, which occurred approximately 251 million years ago, set the stage for the massive terrestrial invasion of the dinosaurs some 20 million years later.
  • During the Triassic period, dinosaurs started to diversify, thriving throughout the Jurassic and Cretaceous periods until their extinction 65 million years ago, at the end of the Cretaceous period.
  • The reign of the dinosaurs lasted for over 160 million years, and dinosaurs include the largest land animals ever!

Author: Emma Schachner
Last updated: 13 November 2004
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Websites produced by students on the MSc Palaeobiology programme in the Department of Earth Sciences at the University of Bristol for academic year 2004-5