Tyrannosaurus Rex Lived Closer to Us Than to Stegosaurus

This fact illustrates the vast spans of time involved in Earth's history. Stegosaurus lived during the Late Jurassic period (150-155 million years ago), while Tyrannosaurus Rex lived during the Late Cretaceous period (66-68 million years ago). That means approximately 85-90 million years separated these two dinosaurs - longer than the 66 million years that separate T. Rex from modern humans. When T. Rex roamed the Earth, Stegosaurus fossils were already ancient relics buried deep underground. This timeline helps us understand that 'the age of dinosaurs' wasn't a single era, but spanned an enormous period with dramatically different species evolving and going extinct across hundreds of millions of years.