单词	duricrust
释义	duricrust /ˈdjʊərɪkrʌst / noun Geology A hard mineral crust formed at or near the surface of soil in semi-arid regions by the evaporation of groundwater: resistant bedrock or duricrusts appear at the surface [mass noun]: he crunched over concrete and then duricrust... A resistant rock cap such as a hard sandstone or a duricrust is one possibility. The Molopo River was sampled by first removing the duricrust and then sampling the underlying sediments. Due to the scarceness of datable sediments saprolites and duricrusts were widely used as defining features. Origin 1920s: from Latin durus 'hard' + crust.
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