How much of the Earth's crust contains sedimentary rock or evidence of aqueous deposition? How much of the Earth's surface is covered by water? How certain are you that all physical processes have taken place at the same rate and in the same degree as recorded throughout history by the human observers in whom you place confidence?
We're dealing with soils, not rocks. Its a whole different subject. (Better bone up on it a little; its one of my sedimental favorites.)