The Jurassic is a geologic period and stratigraphic system that spanned from the end of the Triassic period 201.3 million years ago (Mya) to the beginning of the Cretaceous period approximately 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era. The Jurassic is named after the Jura Mountains in the European Alps, where limestone strata from the period were first identified.
