In 1912, the German scientist Alfred Wegener proposed a radical theory for the time. He hypothesized that all of Earth’s landmasses had once been connected, but had been drifting apart ever since. He came to this theory of continental drift after observing how all of Earth’s landmasses, if you ignored shorelines and looked instead at continental shelves, seemed to fit together like a jigsaw puzzle. As shown in Figure 1, South America tucks nicely into Africa, as do Antarctica, India and Madagascar. Figure 1 also shows how the fossil record supports the theory of continental drift. Cynognathus was a land reptile so it could not have swam across an ocean, and yet its fossil remains are found on both sides on the Atlantic. Similarly, fossil remains of the fern Glossopteris can be found in Antarctica even though its present day climate is too cold for plant life. This indicates that Antarctica was much closer to the equator at some point in its geological past.
Credits to quipper school:)