Mesosaurus fossils are found in rocks The
remains of Mesosaurus- a crocodile-like reptile tells us that South America,
Africa and Antarctica were once joined together which means they were once a
big continent. It is called marine (ocean-living) reptiles, or at the least land-dwelling reptiles that returned to living. However, due to the theory known as the continental drift, this
one big continent started to break thus creating individual continents.