Original: 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 .
Simplified: Laurasia included most of the landmasses which make up todays continents of the northern hemisphere , chiefly Laurentia ( the name given to the North American craton ) , Europe , Baltica , Siberia , Kazakhstan , and China .