The Triassic-Jurassic mass extinction event occurred 205 million years ago.  During this extinction, 23% of all families, 48% of all genera went extinct and about half of the species of Earth were wiped out.  This event happened around the time period that the supercontinent Pangea began to break into continents.  Scientists believe that this extinction killed most of the competition of dinosaurs and resulted in the beginning of the reign of the dinosaurs.   There are several theories of why this extinction period happened but none are very conclusive.

BBC Nature – Triassic-Jurassic mass extinction videos … http://www.bbc.co.uk Triassic-Jurassic mass extinction. During the final 18 million years of the Triassic period, there were two or three phases of extinction whose combined …

end-Triassic extinction | Britannica.com http://www.britannica.com End-Triassic extinction, also called Triassic-Jurassic extinction, global extinction event occurring at the end of the Triassic Period (252 million to 201 million …

Triassic–Jurassic extinction event – Wikipedia en.wikipedia.org The Triassic–Jurassic extinction event marks the boundary between the Triassic and Jurassic periods, and is one of the major extinction events of the Phanerozoic …

Rethinking the Triassic-Jurassic Mass Extinction … http://www.realclearscience.com Editor’s Note: This article was provided by our partner, ScienceNordic. The original is here. About the time, 201 million years ago, that the super-continent Pangaea …