From Wikipedia, the free encyclopedia
Jump to: navigation, search

The Mesozoic was the geological era in which dinosaurs lived, among with other animals. It lasted around 186 million years, starting 252.2 mya (million years ago) with the P/Tr extinction and ending 66 mya with the K/T extinction (the one that killed dinosaurs).[1]

Dinosaurs actually appeared around 231 mya (21 million years after the begining the Mesozoic), evolving from early reptiles called the archosaurs (a group of which modern birds and crocodiles are still part).

The Mesozoic is the middle of the three eras that make up the Phanerozoic eon. The Mesozoic is divided into three periods: the Triassic, the Jurassic and the Cretaceous. Before the Mesozoic was the Palaeozoic era. The K/T extinction in 66 mya also marks the beggining of the Cenozoic era, the one we currently live in.

The three Mesozoic periods, epochs and time of occuring were:

References[change | change source]

  1. Gradstein, Felix M. James G. Ogg, Alan G. Smith (eds) 2005. A geologic time scale 2004. Cambridge University Press. ISBN 0-521-78673-8