(geology) Of or pertaining to the second period of the Mesozoic era, a time still dominated by dinosaurs. / Of or pertaining to the people or region near the Jura Mountain Range of Europe.

(geology, paleontology) The period from 201.3±0.2 to 145 million years ago, after the Triassic and before the Cretaceous; the geologic systems of this period.

A mass extinction between the Triassic and Jurassic periods 201.3 million years ago.