I see you looked up my reference to the Nile River Canyon. However can you explain how the Nile River cut the canyon through multiple layers of sedimentary rocks that contain fossils (had to have been laid down before the river cut through them) and then the crystalline basement rock. That takes a lot of time. Then the Mediterranean Sea had to fill the canyon at which point the canyon would be full of sea water. Then the Nile River would have to gradually fill this canyon with the sediment carried from the head waters. It would take a very long time to fill the canyon and then generate the current delta that extends out into the Mediterranean. And all of this was accomplished in just 6000 rotations around the sun?
BTW, full details can be found here, Naturalis Historia - The Lost Grand Canyon of Egypt