It was first discovered near Fruita, Colorado in 1900, a location that is now part of the Morrison Formation. The first of these two to be discovered was Brachiosaurus its name means “arm reptile,” in reference to its characteristically long forelimbs. The closely related genus Giraffatitan, which most popular depictions of Brachiosaurus are based on, lived during a slightly broader span of time ranging from 150 to 145 million years ago. Brachiosaurus is a genus of extremely large sauropod dinosaur in the family Brachiosauridae known from the late Jurassic period, 154 to 153 million years ago.
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