A small history of life on Earth, from its origins 4.3 billion years ago, is the starting point of the? Illustrated Inventory of Dinosaurs ?, which brings together 47 species grouped in geological periods: from the Triassic, with specimens such as the Mussaurus patagonicus; continuing through the Jurassic with the presence of Diplodocus carnegii; until the Cretaceous, when the Tyrannosaurus rex inhabited.