Sigh. During the Flood there would have been SHORT periods of exposure at the surface BETWEEN WAVES AND TIDES, during which ripples and minor erosion and footprints could have occurred to the wet sediments, but NOT the kind of erosion that occurs to land that is aerially exposed for years on end, which would be visible in the strata from across the whole canyon.
Large paleovalleys carved into the underlying Redwall Limestone developed through dissolution i.e. karstification, and likely were enlarged by west-flowing streams. --- Timons and Karlstrom (eds.), Grand Canyon Geology, Geological Society of America, 2012.
Sink holes, caverns, and solution cracks common in upper parts of the Redwall limestone are in places partly or entirely filled with red mudstone accumulated during deposition of the overlying Supai formation. --- E. D. McKee, U.S. Geological Survey, "The Redwall Limestone", Ninth Field Conference of the New Mexico Geological Society
The top of the Mississippian Redwall limestone in the Grand Canyon area was subject to extensive karstification during a period of about 30 million years from the late Meramacian to early Morrowan time. This hiatus has recently been shown to be much shorter, possibly only 5 million years, in the western Grand Canyon where tidal and deltaic channels draining westward toward the retreating sea are eroded into the Redwall surface. These channels have average depths of about 107 m (350 ft). --- T. Troutman, University of Texas at Austin, "Genesis, Paleoenvironment, and Paleogeomorphology of the Mississippian Redwall Limestone Paleokarst, Hualapai Indian Reservation, Grand Canyon Area", Cave Research Foundation Newsletter vol. 29 no. 1, 2001.
You would not have those neat level horizontal strata ANYWHERE AT ALL had that ever occurred to ANY of the layers.
You posted this gibberish before but didn't attempt to justify it. Why would erosion of one layer affect the unaffected underlying layers?
If you think about it, even you must admit that the top of the Grand Canyon, the Kaibab Limestone, is
currently undergoing subaerial erosion. Yet without affecting the surfaces of the strata beneath it, which, if flat, are remaining so.
That's why I specified that the stack above the basement rocks was to be the focus.
Ah, you don't know what "basement rocks" means, then? As to
why you want to except such a glaring exception, I think we can guess.
However, I believe the Great Unconformity, as I have argued here before, was also created after ALL the strata were laid down, created by the forced tilting and sliding of a segment of the lowest strata by the volcanic activity beneath the Canyon, which had sufficient force to tilt that segment but not enough to disrupt the horizontality of the stack above it, although the entire region was lifted upward, stack and all.
You did indeed argue that.
Oh, how we laughed.
™ Version 4.2
