Many if not most forms of erosion leave tell-tale signs behind indicating what process it was. The products of the really slow ones would look differently in some respects than those of the rapid or catastrophic forms, such as floods and storms.
Can you submit with any degree of certainty that the effects of a rapid erosion event precipitated by another catastrophic event would be the same regardless of whether it was preceded by hundreds or thousands of years of slow erosion and thermal cycles or not?