continental drift
To spin off on another bit of misunderstanding (stop me if we need to finish with uniformitarianism):
If you want to be nit picky the idea of
continental drift was, in fact,
wrong. A huge difficulty with the idea of any mechanism was the problem of continents plowing through the sea floors. And, now, we see that they don't "drift". The whole surface of the earth moves and the continents are just carried along.
I think this is important to understand. Wegner's idea was, at some high enough level, 'right' but not 'right' enough to become a compelling theory of geology. It had to be modified significantly first. As he was talking about it the detractors were correct. It isn't possible. (That is as I think he was talking about it, I've never seen anything original by Wegner)