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Landscapes formed during the Jurassic
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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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