The calcium sulfate (the main component of the gypsum dunes) was formed millions of years ago at the bottom of the seabed when the sulfur from hydrothermal vents and Calcium carbonate from invertebrates got bounded together by a chemical reaction.
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Details
Title: Cuatro Ciénegas gypsum dunes formation
Creator: Nicolás Sánchez-Mejorada Girault
Location Created: Cuatro Ciénegas de Carranza, Coahuila.