Image from article.
http://craigstocksarts.com/SlotCanyonSky.jpg
For what one looks like full of water see The Bolton Strid...
I’m not a geologist, but I am very familiar with slickrock and slot canyons. And it seems to me the basic patterns are consistent with sand deposited by wind, not by water.
Or at least I’m not familiar with any underwater dune formations hundreds of feet high.
Bull crap. Morris is full of it. The Grand Canyon was not formed in a global flood 3000 years ago. That is utter nonsense. Noah’s flood was universal (all humanity), but localized to the Middle East.