Alfred Wegener proposed the theory of continental drift but could offer no plausible mechanism by which it occurred. The proponents of the theory imagined that the continents plowed their way through the static ocean floor.
Paleontological evidence that supports continental drift was dismissed because such drift was "impossible".
However, under the theory of plate tectonics, continental drift is an inescapable consequence. The same paleontological evidence mentioned above is now cited as "proof" of continental drift!
Ever Since Darwin: Reflections in Natural History by Stephen Jay Gould
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