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Loess is a geologically recent deposit of silt or material which is usually yellowish or brown in color and consisting of tiny mineral particles brought by wind to the places where they now lie. It is a product of past glacial activity in an area. It is a sedimentary deposit of mineral particles which are finer than sand but coarser than dust or clay, deposited by the wind. Loess is a type of silt which forms fertile topsoil in some parts of the world. Loess deposits are usually a few meters thick. One of the key characteristics of these deposits is the âcat steps'. The soil has few clay particles to hold it together.
It narrows to the south, in places becoming extremely thin. For much of their extent in Missouri, the Loess Hills are reduced to a sliver that barely extends east of the westernmost bluffs. Loess (pronounced luss) is a German word meaning loose and it is the name of a type of soil.Loess is a deposit of fine, yellowish-gray, clay-like sediment which can be found from north central Europe to eastern China and in the American Midwest.eep loess landforms are best developed in a strip between 3 and 10 miles wide along the edge of the Missouri River valley. In general, the bank of deep loess landforms is greatest to the north, in Harrison, Monona, Woodbury, and Plymouth counties, Iowa.