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The galleries of the Grotte de Clamouse have developed on three main levels :
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The upper level, fossilised into huge halls abundantly decorated with great banks of concretions, noted for the fine sparkling white crystallations of calcite and aragonite which have made the cave internationally famous.
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A middle level, still occasionally flooded in the wet season. It consists of a network of galleries hollowed out by corrosion of the dolomitic rock with walls cut out into "stone lacework". This part is known as the "labyrinth" and is where the early explorers used to get lost.
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A lower level, constantly drowned by the water of the underground river where the water level varies with the amount of rainfall.
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These three gallery systems built up gradually on top of each other as the bed of the Hérault sank. They are the evidence of the stages of the gorge's erosion over the last few million years.
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In 1907, there was particularly heavy flooding which provided a photo opportunity to show the strength of the water (resurgence) surging out of the natural entrance to the cave.
This flood submerged the road below the resurgence, an event which occurred just three times in the 20th century.
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