Loess is an aeolian windborne sediment being an accumulation of: twenty percent or less clay and the balance mainly equal parts sand and silt typically from 20 to 50 micrometers per particle   often loosely cemented by calcium carbonate. It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs. Loess is homogeneous , porous , friable , pale yellow or buff , slightly coherent , typically non- stratified and often calcareous. Loess grains are angular with little polishing or rounding and composed of crystals of quartz , feldspar , mica and other minerals. Loess can be described as a rich, dust-like soil.
Curbing Desertification in China
Desertification in China - Photographs and text by Sean Gallagher | LensCulture
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How glowing sediment can help to decipher the Earth’s past climate !
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The region is characterized as a typical semiarid area of northern China Su et al. The OSL is one of the four great sandy regions of China, and desertification of this region is particularly serious in the farming-pastoral ecotone of northern China Li et al. Therefore, land desertification in the OSL has become a global problem that requires urgent mitigation.