It’s Allosaurus and Stegosaurus. ⁣ These two dinosaurs lived during one of the most famous periods of the Mesozoic, the Jurassic. The Jurassic period lasted from 201 to 145 million years ago and lent its name to the 90s blockbuster Jurassic park. The Mesozoic era, or the age of dinosaurs, is split into three periods, starting with the Triassic, then the aforementioned Jurassic, and lastly, the Cretaceous. But where do the names for these famous periods come from? ⁣ ⁣ Triassic (251.9 – 201 millio