great sea reptiles of the jurassic period mosters dinosaurs The Jurassic is a geologic period and system that extends from about
The Jurassic is a geologic period and system that extends from about ± Ma (million years ago) to ± 4 Ma, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the "Age of Reptiles". The start of the period is marked by the major Triassic–Jurassic extinction event. However the end of the Jurassic Period did not witness any major extinction event. The start and end of the period are defined by carefully selected locations; the uncertainty in dating arises from trying to date these horizons. The Jurassic was named by Alexandre Brongniart for the extensive marine limestone exposures of the Jura Mountains, in the region where Germany, France and Switzerland meet.
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