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The loess deposits found along both sides of the Mississippi River Alluvial Valley are a classic example of periglacial loess.During the Quaternary, loess and loess-like sediments were formed in periglacial environments on mid-continental shield areas in Europe and Siberia, on the margins of high mountain ranges like in Tajikistan and on semi-arid margins of some lowland deserts like in China. It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs.The word loess, with connotations of origin by wind-deposited accumulation, came into English from German Löss ( Loess is homogeneous, porous, friable, pale yellow or buff, slightly coherent, typically non-stratified and often calcareous.
Because the grains are angular, loess will often stand in banks for many years without slumping.One theory states that the fertility of loess soils is due largely to cation exchange capacity (the ability of plants to absorb nutrients from the soil) and porosity (the air-filled space in the soil).The fertility of loess is not due to organic matter content, which tends to be rather low, unlike tropical soils which derive their fertility almost wholly from organic matter.For almost 150 years, this loess deposit was farmed with mouldboard ploughs and fall tilled, both intensely erosive.At times it suffered erosion rates of over 10 kilograms per square meter per year.
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Winds pick up loess particles, contributing to the Asian Dust pollution problem.