Named for the Jura mountains where the first deposits were found. It is the middle period of the Mesozoic Era . From 208 to 145 million years ago. The group of diapsids that include lizards and snakes. The class to which all mammals including primates belong.
Mammals have hair and mammary glands and give birth to live young.
These animals all have some kind of bony frill at the back of the skull. The group includes the pachycephalosaurs and ceratopsians. Several extinction events occured during the Mesozoic Era . The age of the donsaurs, it includes the Triassic , Jurassic , and Cretaceous Periods. Spans 250 to 65 million years ago.