The supercontinent that existed at the beginning of the Mesozoic Era is called Pangaea. Pangaea was a supercontinent that formed around 300 million years ago during the late Paleozoic and early Mesozoic eras. It consisted of all the major continents we know today, including North America, South America, Africa, Europe, Australia, and Antarctica, fused together as one landmass. Throughout the Mesozoic Era, Pangaea started to break apart, ultimately leading to the formation of the present-day continents.
