The Triassic Period started with much of Pangea, the supercontinent, still intact. The dominant animals were reptiles, but not the dinosaurs, as they were outcompeted by other ancient reptiles like crocodilian ancestors. The Triassic Period ended with a mass extinction caused by Pangea breaking apart, resulting in volcanic activity, global climate change, and dinosaurs coming out on top.

During the Jurassic, the land was constantly splitting in two, slowly separating and resulting in more coastline for forests and diversification. The Age of Dinosaurs begins here and we see a rapid diversification of dinosaurs from the stegosaurs to theropods (the two-legged meat eaters). We even see the first birds start to evolve around this time as well as very small mammals hiding in the underbrush.

The Cretaceous Period starts when the continents had fully split, and from this point on the continents we know today start to take shape and separate from each other. Because of the range of climates and environments available, the diversity only increases, with flowering plants, insects, a variety of plant life having evolved. The Cretaceous Period ended when a 70km wide asteroid struck in the Gulf of Mexico, ejecting enough debris into the atmosphere to block out half of all sunlight and alter the temperature of the earth, resulting in a global ecosystem collapse from the bottom up.