Dinosaur Bone 2 The Jurassic period was the

The Jurassic period was the middle of three periods

usually red

Some bone was used from the collection of Robert and Louise Green estate

a blue feldspathoid silicate mineral

Dinosaur Bone 2 The Jurassic period was theDinosaurs emerged between 240 million and 230 million years ago. They existed until about 66 million years ago when a giant asteroid slammed into the earth in the Yucatn Peninsula in Mexico. Dinosaurs first appeared in the Triassic period (251. 9 ma to 201. 3 ma); they roamed the supercontinent of Pangaea. But by the time the asteroid hit at the end of the Cretaceous period (145 ma to 65 ma) the continents were in approximately the same place they are