Limestone: nm Alkaline sedimentary rock, which favors the production of grapes with a relatively high acidity rate. The calcareous soils formed of calcium and magnesium carbonates allow the roots to penetrate the earth and provide them with excellent drainage.
The best examples are undoubtedly the area of the grands crus of Saint-Émilion, Alsace or the Loire.
See: Marne, Craie, tuffeau (variety of porous and soft calcareous tuff).
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