Straight Sedement and Rock formations, not wavey

So as a curious Evolution/Creation studier, i was just wandering if the science/evolutionary people have a reason for rocks at like the grand canyon or other parts that havey flat rock and perfectly laid down. It appears like it was laid down rapidly, so wouldnt that be in support of the flood when the waters receded. Also wouldnt that mean in terms of creation theory that the rocks at the bottom are actually the youngest and the rocks at the top are the oldest??