They probably reached as far as North America along coastal waters : either around Africa and over to South America , or , more likely , over the Tethys Sea ( between Eurasia and Africa ) and along the coasts of Europe , Greenland , and North America .
They could have gone around Africa and over to South America . More likely , over the Tethys Sea ( between Eurasia and Africa ) and along the coasts of Europe , Greenland , and North America .