Laurasia was a supercontinent that most recently existed as a part of the split of the Pangaean supercontinent in the late Mesozoic era. It included most of the landmasses which make up today's continents of the northern hemisphere, chiefly Laurentia (the name given to the North American craton), Baltica, Siberia, Kazakhstania, and the North China and East China cratons. The name combines the names of Laurentia and Eurasia. Origin Although Laurasia is known as a Mesozoic phenomenon, today it's… (More on Laurasia)