What was the giant landmass called and how long ago did it exist?

The giant landmass was called Pangaea, and it existed during the late Paleozoic and early Mesozoic eras, approximately 335 to 175 million years ago. Pangaea was a supercontinent that eventually broke apart due to tectonic plate movements, leading to the formation of our current continents. Its existence played a crucial role in shaping the Earth's geology and climate.