The breakup of Pangaea started during the Jurassic period and continued through the Cretaceous period, considered to be the last portion of the age of dinosaurs. The Triassic, Jurassic, and Cretaceous periods were not originally designed as a method to keep track of when certain dinosaurs lived, bur were marked by geologists as a way to distinguish between different types of geologic strata given that dinosaur fossils are embedded in these rocks, paleontologists associate dinosaurs with the geological period in which they lived. Walking With Dinosaurs, Jurassic Fight Club, When Dinosaurs Roamed America, Mammals vs Dinos, Dinosaur RevolutionĪ comparison of the sizes of various species of Tyrannosaurus with a humanĪllosaurus lived in the Jurassic period, 150 million years ago, while Tyrannosaurus Rex lived in the Cretaceous period, 65 million years ago. More than 30 partial Tyrannosaurus specimens have been found since. More than 150 Allosaurus specimens have been found. Teeth from what is now documented as a Tyrannosaurus rex were found in 1874 by Arthur Lakes near Golden, Colorado. Its legs were extremely big and powerful. United States (Texas, New Mexico, Colorado, Wyoming, South Dakota, North Dakota, and Montana) and Canada (Alberta, Saskatchewan)īipedal powerful tail allowed it to move quickly could run up to 25 kmph. Late Cretaceous Period (67-65 million years ago) Late Jurassic period (150 million years ago)
Differences - Similarities - Allosaurus versus Tyrannosaurus comparison chartĬarnivorous preyed on armored herbivorous dinosaurs, other T.
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