Loess
In some parts of the world the surface topography is mantled with deposits of windblown silt termed loess. Over thousands of years dust storms deposited this material. When loess is breached bystreams or road cuts, it tends to maintain vertical cliffs and lacks any visible layers, as you can see in gradually become concentrated into a tightly packed layer as deflation lowers the surface by removing sand and silt. In this situation, desert pavement is the result of deflation. B. This model shows the formation of desert pavement on a surface initially covered with coarse pebbles and cobbles. Windblown dust accumulates at the surface and gradually sifts downward through spaces between coarse particles. Infiltrating rainwater aids the process This depositional process raises the surface and produces a layer of coarse pebbles and cobbles underlain by a substantial layer at fine sediment