John Paul writes:
It was a continent splitting up and then some of the pieces crashing into each other forming the mountain ranges we observe today.
One byproduct of deformation is heat, and with rapid deformation you get a lot of heat in a very short period of time. The presence of intact sedimentary layers in mountain ranges (as opposed to metamorphic rock, the result of heating sedimentary rock to near or past the melting point) is an indication they were not formed rapidly, at least not within a timeframe of less than a few centuries. If you bend a coat hanger back and forth a few times you'll feel how much heat can be generated from even very small deformation events.
The extinction of the dinosaurs was thought to be caused by a comet or asteroid less than 10 kilometers across. Continents splitting up and crashing about to form entire mountain ranges all around the globe and sea floors dropping would be a major extinction event, possibly the last one. Such events would also leave huge amounts of extremely obvious evidence.
Can your scenario be adjusted to be consistent with what we already know about geology and the behavior of physical materials?
--Percy