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Over 10,000 closed depressions (CDs) are found in the silty plains of Northeastern France. These small wetlands support the growth of rare plant species. Although their origins, which could be anthropogenic or geologic due to salt/gypsum lens dissolution, have been debated for 150years, they have not yet been the focus of an integrated study. In 39 geological borings along a 15-km² strip, no salt/gypsum...
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