Jurassic Period
The Jurassic Period with a duration of 63.7millons of years is the middle period of the Mesozoic
ii began 205.7millons years ago at the end of the Triassic Period ended with the begning of the Cretaceous Period 142 millions years ago. Rocks of this series were first Jurassic 1795 based on Alexander von Humboldt's studies limestone in the Jura mountains of France and Switzer land . The French geologist Alexandre von Humboldt studies limestone in the jura mountains of France and Switzerland .
