The Brachiosaurus did its dino thing on Earth during the latter stages of this period from 200 to 150 million years ago
This animal laid the 
foundation for the true dinosaur giants, which evolved early in the Jurassic and 
became... [DOC] [TLE] Dinosaurs In the News - Crystalinks [PAR] Giant dinosaur footprint discovered in Mongolia desert PhysOrg - September 30, 
... of avian dinosaurs that became extinct at the end of the Cretaceous period.