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The ruiniform reliefs of the Causses
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The ruiniform reliefs are numerous in the Causses and the Tarn and Jonte gorges. Karstic limestone, loaded with carbon dioxide, often turns into dolomite, a rock composed of calcium carbonate and magnesium. Under erosion, the dolomite is transformed into pillars with strange shapes and jagged rocks called lapiaz or lapies like the Arcs de Saint-Pierre in the village of Saint-Pierre-des-Tripiers.
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