Archaeoceti
All archaeocetes from 55 to 48 mya are only from Indo-Pakistan. By 41–34 mya genera are known from across the Earth, including North America, Egypt, New Zealand, and Europe. They were very unlikely to be as well-adapted to the open ocean as living cetaceans, so they probably got to North America along coastal waters. 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.