From a Flood perspective there is a very easy solution. It is the receeding waters that cause the formations. With huge amounts of water causing massive currents the layers are put down. When the level drops below the top layer erosion begins to occurr as the water gourges the surface producing a wide but (relatively shallow) trench. The diminishing water flow undermines the edges until the layer can no longer support the overhang. The face then gives away producing the sheer cliff face as well as the pile of rubble at its base. Now the water subsides a little lower so the process starts again this time producing the same a little closer to the middle of the flow. The process continues to repeat on multple of layers finally after more wind and rain erosion producing the effect we see today.
Except the rocks don't support that. The "piles of rubble" at the base of the sheer cliff are a completely different type of rock. There are some boulders from the cliff-forming unit on top, but the majority of the slope is completely unrelated.
OK back from my busy
There are sedimentarty layers above and below the Coconino said by geologists to be put down by flood but they say the Coco was a windswept desert. This has even put off YEC's but has now been proven to be a fallicy because the tracks are shown to be amphibian.
The Coconino was a desert, but it was located relatively close to the coast. This allowed some rain and inter-dune ephemeral pools to form. The layer above the Coconino is the Toroweap, which was represents a coastal/tidal environment. It has sandstone, siltstone, and limestone. Above that is the Kaibab Limestone, which formed in a shallow sea. No flooding, at least not as you describe. It seems like a normal coastal subsidence progression.
The tracks were made by lizard-like reptiles and insects, not amphibians. And I'm curious as to how they managed to walk on the dunes if these dunes were formed by rushing currents under water.
I dont know where you get your info from but I have read that underwater face angles of 25 deg. are normal (as measured) whereas sand dunes are 30 +deg
The angle of repose of sand on Earth is approximately 30 degrees. This is the
maximum slope that sand grains can form. That is to say, eolian sand dunes can form at lower angles as well.
As for the underwater dune slipface angles, my source for that is Talkorigins, which sadly didn't give a reference for that particular point. If you can give a solid reference for the 25 degree underwater slipfaces being dominant, then I'll concede that the slipface angles are inconclusive.
Not too sure what you on about there . Could you supply a reference
McKee, E. D., 1979. A study of global sand seas: Ancient sandstones considered to be eolian.
U. S. Geological Survey Professional Paper 1052, Reston, VA: USGS. Page 204, to be exact.
Basically, when a dry dune face suddenly receives a lot of rain, the weight and cohesion of the wet sand vs, the dry underlying sand can cause part of the dune to fail and slump. It can't do this if the sand is already soaked all the way through.
This site does a fairly good job of explaining it and even shows some fossilized examples in the Navajo Sandstone (a younger Colorado Plateau sand sea).
Rain on the Navajo Desert
Are they really raindrop imprints or only a quess. Do you really expect us to beleive that rain drop imprints would actaully stand millions of years of weathering
They don't have to stand up to millions of years of weathering. If it rains and the imprints are immediately covered by sand, they can be preserved in between layers without ever being exposed to the surface. And while we can't prove for certain that they're rain drop imprints, they sure as heck look like what you see after it rains on sand.
Not the best picture since it shows the casts from the layer on top rather than the actual impressions, but this is what I'm talking about.
Are they only termed ancient because they have "ancient" fossils in them, and are they only ancient fossils because they have been found in "ancient soil beds"
Whether they are ancient or not has nothing to do with it. How does soil form in fast-moving water over the course of a year?
Sorry. I thought you said I was attacking you.
And you
still haven't answered my question.
Easier to erode back a cliff? Ok. 10 times? 20 times? 100 times? 20,0000 years then. 200 times easier? 40,0000 years then.
Rate of change of a riverbed is proportional and changes according to the amount of water flowing through it. Granted, Niagra has 100 times the volume. But I'm thinking over 1000 times that anyway.
I honestly don't know what the numerical difference is. My point is that you can't use the rate at which a cliff erodes back to relate to the rate at which a river carves down. There are too many different variables between the two situations.