When and where was trex found?

Tyrannosaurus rex teeth were first found in 1874. In 1900, paleontologist Barnum Brown discovered the first partial skeleton of T-rex. All T-rex fossils have been found in the western USA and Canada.

Tyrannosaurus rex lived between 68 and 65.5 million years ago. That was at the end of the Maastrichtian stage, the last stage of the Cretaceous time period. They became extinct 65.5 million years ago, during the K-T mass extinction event.