One of the mysteries of the English language finally explained.
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’
- ‘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.’
- ‘This duricrust has hindered mineral exploration, beyond the valley floors, for the past 70 years.’
- ‘A resistant rock cap such as a hard sandstone or a duricrust is one possibility.’
- ‘The more water soluble duricrusts, such as calcrete and gypcrete, can have solution holes or pits.’
1920s: from Latin durus ‘hard’ + crust.
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