UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

Fine-grained and poorly consolidated windblown sediment, mainly of silt. Great thicknesses of loess are found in areas marginal to hot and cold deserts, where the prevailing wind deposits fine dust particles blown from the desert basins or out of glaciofluvial sediments. Loess is a common allogenic component of soils on limestones. Large numbers of artificial caves have been excavated in the hillsides of soft loess in central China [9].