The gypsum (calcium sulfate) that forms the dunes of Cuatro Cienegas is composed of calcium from the snails and shells that inhabited the Cretaceous seas (time of the dinosaurs).
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Details
Title: Cuatro Ciénegas gypsum dunes
Creator: Nicolás Sánchez-Mejorada Girault
Location Created: Cuatro Ciénegas de Carranza, Coahuila.