caliche

Noun
  1. Crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions (synset 114869748)
    is a type of: dirt, soil - the part of the earth's surface consisting of humus and disintegrated rock
    same as: hardpan
  2. Nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru (synset 114723602)
    is a type of: rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust

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