Other forms: Triassics
In Earth's geological history, the Triassic period was the very beginning of the "Age of the Dinosaurs," starting about 250 million years ago, before the Jurassic period, in the Mesozoic era.
The term Triassic was coined from a Greek word meaning "three." It was used to refer to a distinct, three-layered rock sequence found by geologists in Germany just below Jurassic rocks. While less famous than the Jurassic, the Triassic ushered in the first dinosaurs, along with very small, early mammals. For most of this period, Earth's land was clustered into one supercontinent, Pangea, which only began to break apart at the end of the Triassic.