The Brachiosaurus did its dino thing on Earth during the latter stages of this period from 200 to 150 million years ago
The eight or so known specimens date to 
approximately 150 million years ago during the Late Jurassic Period (161 million 
... Brachiosaurus, which lived 150 million to 130 million years ago... [DOC] [TLE] Late Jurassic Dinosaurs - ZoomDinosaurs.com - Enchanted Learning [PAR] Sea levels were high, there was no polar ice and the Earth was warmer than it is 
now.