This IS a site for DEBATE between creationists and evolutionists, right? Apparently ThinAir won't discuss anything with a creationist. Now they are discussing how water sorts according to size. Yes, and so what? We'd expect to see this in the Flood wherever Walther's Law applies, and perhaps also in strata laid down by waves as beach sand is, the heavier larger particles depositing on the bottom of the layer. This would take examining a lot of layers everywhere. Just off the top of my head I'm aware of some layers of coarser material that occur higher in the column than other layers, in the Grand Canyon as well as the Grand Staircase, but this needs checking.
The purpose of the original thread is very clear and focused. ThinAir is looking for teaching ideas to help convince YECs that the earth and universe are old. He is NOT trying to discuss whether or not the earth really IS old, whether or not there was a global flood, or whether or not flood geology explains anything. His thread starts with an old earth as a "given" and works from there.
"Science without religion is lame, religion without science is blind." – Albert Einstein
“I am very astonished that the scientific picture of the real world around me is very deficient. It gives us a lot of factual information, puts all of our experience in a magnificently consistent order, but it is ghastly silent about all and sundry that is really near to our heart, that really matters to us. It cannot tell us a word about red and blue, bitter and sweet, physical pain and physical delight; it knows nothing of beautiful and ugly, good or bad, God and eternity. Science sometimes pretends to answer questions in these domains, but the answers are very often so silly that we are not inclined to take them seriously.” – Erwin Schroedinger