I have see flume experiments where turbidites of very fine matter laid
deposits in minutes, which under normal still water settling which Stokes
law describes would take a very long time. Stokes law is not the
problem. The problem is in conception. A fast moving flow of water will
carry a much heaver load of fines than the same volume of still water.
And when that fast flow of water is suddenly stopped, it will quickly
drop all the fines which could not be held in suspension by still (or
nearly) still water.
The sames hold true from carbonates. It is assumed that some limestones
were formed from disolved carbonates priciptation out of water. Ofcourse
this would take a long time. Or, that some limestones were the result of
calcarious remnants small sea creatures which slowly settled over long
periods of time. However, the carbonates need not be disolved in the
water but maybe globlets of carbonate muds caught temporarily in
suspension due to the turbulance of the water. These could then fall
quickly out when the waters lost enough energy to no longer be able to
hold the gloglets.
Grand Canyon Creationary Geology Tours, see: