They are not. A simple query would tell you that, so apparently you are not interested in engaging in informed debate.
I have seen canyons, cliffs and mountainsides all over the world and the same thing is evident: consistent depth and thickness of layers. That doesn’t mean it is absolutely everywhere, just that it is the norm rather than the exception.
You are asking people to believe that over the course of hundreds of millions of years, very large areas have no detectable erosion or seismic displacement.