The presence of Mesosaurus fossils tells scientists that South America and Africa were once joined together as part of a single landmass, rather than being separate continents divided by the Atlantic Ocean.

Quick Scoop

  • Mesosaurus was a small, early Permian reptile that lived in shallow freshwater environments, not in the open ocean.
  • Its fossils are found in rocks of the same age in eastern South America (Brazil) and western Africa, thousands of kilometers apart today.
  • Because Mesosaurus could not have swum across a vast saltwater ocean, the matching fossils strongly suggest those regions were once physically connected.

What the fossils reveal about continent positions

For the classic school question “what does the presence of Mesosaurus fossils tell about the initial location and position of South America and Africa?” the key points are:

  1. South America and Africa used to fit together as a single continuous landmass (part of the ancient supercontinent Pangaea or the southern block Gondwana).
  1. The coastal margins of Brazil and western Africa were once side by side, sharing the same freshwater habitats where Mesosaurus lived.
  1. The continents later drifted apart due to plate tectonics, leaving identical Mesosaurus fossils on opposite sides of the Atlantic as “matching pieces” of evidence.

So, in short: the presence of Mesosaurus fossils on both sides of the Atlantic is powerful evidence that South America and Africa were originally connected and have since moved to their present positions.

Information gathered from public forums or data available on the internet and portrayed here.