The fine sediments are transported in suspension, they are carried into the lake and slowly settle out of the suspension. The glacial lake bed deposit becomes dominated by fine grained sediments. It is possible to transport and deposit coarse clasts in a glacial lake if coarse debris is carried by icebergs into the lake and they rain out as the iceberg melts. The glacial till is unsorted. This material was eroded and transported by a glacier and deposited directly from the glacial ice.
Deposition can occur beneath the ice mass at high pressure or as the glacial ice melts.
There is no sorting of material by flowing water or wind, and thus till deposits are often unsorted. The dune deposit has a mean grain size of 0.25 mm, while the river bar deposit has a mean grain size of 0.44 mm. The dune sands were transported by air, the river sands by water. The density of air is very low relative to water. At a given velocity, flowing water can erode and transport larger grains because it exerts more stress on resting materials due to its higher density.