Makes perfect sense, and I see where things all tie together. Nice. I think you deserve all the points on this one for putting up with our rampant speculation!!!
bingo!
![laugh \:D](/forums/images/graemlins/default/laugh.gif)
now who's the bean counter?
![laugh \:D](/forums/images/graemlins/default/laugh.gif)
another factor w/ clay size particles is ionic attraction. silt and sand settle, but gravity may have little to no affect on the clay depending on the water chemistry.