About 750 million years ago ( 750 Ma ) , the previous supercontinent Rodinia rifted apart into three continents : Proto-Laurasia ( which broke apart and eventually re-formed as Laurasia ) , the continental craton of Congo , and Proto-Gondwana ( all of Gondwana except the Congo craton and Atlantica ) .
They were Proto-Laurasia ( which broke apart and eventually re-formed as Laurasia ) , the continental craton of Congo , and Proto-Gondwana .