Geologic/Tectonic events
At the start of of the Triassic, all of Earth's land masses had collided into Pangea.There was a giant ocean called Panthalassa that surrounded Pangea and areas around the coast were overtaken by seasonal monsoons.But, the ocean-circulation patterns kept the isolated and vast interior warm and dry.This time period also gave a rise to new creatures, including rodent-size mammals and the first dinosaurs.