On top of that, Wegener learned that related species, too small to swim the oceans, were found on different continents, as were similar fossils. In 1912 he proposed that the continents we know ...

This is understandable, given that knowledge about the Earth's tectonic plates was formed during a period when we also discovered fossil fuel reserves offshore from continental shelves.

It's difficult to imagine a process more gradual than continental drift. But some scientists say ... Depending on location and interpretation, the fossil record seems to say different things.