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Landscapes formed during the Jurassic
In the Jurassic (201 to 145 million years ago), the Atlantic Ocean was formed when Pangea broke up. Sedimentary limestone rocks were deposited in the Grands Causses and the Avant-Causses. Rainwater infiltrated and dug into the dolomites composed of calcium and magnesium carbonate. Such a process formed ruiniform reliefs and massive canyons like the Gorges du Tarn. The Grands Causses are listed as a UNESCO World Heritage Site.
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