Do you know what the stacked strata consist of?
Are they solid rock or conglomerate, and how would each have had to be deposited due to the particle size?
What kind of rocks form the layers, and why are they in the order that they are in?
How do you explain the sloping sides of mesas and buttes, and the isolated thin, vertical shape of spires? I saw what kind of erosion flood waters make (from some flash floods that occurred this past February there), and they cause perpendicular banks, not sloping banks.
Why, for example, would Spider Rock, a precarious spire hundreds of feet tall, be left in the middle of Canyon de Chelly and not swept away by raging flood waters?
Keep in mind that the tracks you see on the canyon floor are jeep tarcks and the "littel bushes" down there are actually trees which are quite large.