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The Jurassic is a geologic period that extends from 201 million to 145 million years ago, 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. It is named after the Jura mountains on the border between Switzerland and France, where rocks of this age were first studied.


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The Triassic Period was the first period of the Mesozoic Era. It occurred between 251 million and 199 million years ago. This period marked the beginning of major changes that were to take place throughout the Mesozoic Era, particularly in the distribution of continents, the evolution of life, and geographic allocation of living things.


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