Hi bohn
Your trying to draw me into speculation about the flood! The Bible says there was one and racial memory of a flood supports this, from one end of the earth to another.
Since the requirements to know what a world-wide flood would do to the earth would be to have it redone (including the original conditions) to see the consequences. I cannot see how anyone would know without flooding the world again what it's geological fingerprint would be.
Maybe they are looking for something small when they should be looking for huge. Or maybe looking right at it but not seeing it for what it is.
I'm not a geologist and to try and pretend I am is just silly. But as I said before whether they are looking for proof or disproof starting from either viewpoint makes for a biased position when then looking at the evidence and so will contaminate the results.