Origin of the Flood Layers

Re: As I see that photo, the top of the sandstone is actually about twice as far up as where you drew the upper yellow line. The top is the redder material at the upper-left corner. The part between the yellow lines is more or less vertical, and the part between the top yellow line and the redder top is more beveled back, thus the shadow difference. I'm guessing that a few inches of sandstone thickness is being shown there, and that it is thicker further back, outside the photo frame.The sandstone left there is an erosional remnant - The sandstone used to cover the entire area of the photo. It's NOT that the sandstone stopped being deposited at that point, with the larger quartz clasts being pushed at the front. There are most likely more large quartz clasts still conceiled in the sandstone. OR PERHAPS the quartz chucks are the remains of vein material, still in place. Hard to say without looking at it in person, and also without seeing the larger context.Moose

What was the nature of the statigraphy before the start of the cutting of the Grand Canyon?Wasn't it something like this (below), minus the V shaped notch that is the Grand Canyon? (pulled this graphic from here)Wasn't the Vishnu Schist covered by the Tapeats Sandstone, in the areas without the angular preCambrian sediments?You make it sound like all those sediments were piled up, except for the open volume of the canyon. That the canyon wasn't cut by erosion, but rather it's there because of non-depositon of sediments.Moose