Geology
White Sands is home to the world's largest gypsum dunefield, a dazzling landscape shaped by unique geological forces over millions of years.
Plan Around Geology
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Geology Details
White Sands is home to the world's largest gypsum dunefield, a dazzling landscape shaped by unique geological forces over millions of years. Unlike typical sand dunes made of quartz, White Sands' dunes consist of pure gypsum, a mineral that rarely forms extensive sand deposits because it dissolves in water. So how did this otherworldly landscape come to be? The story begins around 280 million years ago when a vast, shallow sea covered the region, depositing thick layers of gypsum and other minerals. As the sea receded and the land rose, these ancient deposits remained buried until geologic forces lifted them to the surface. The formation of the Tularosa Basin, where White Sands sits today, was a crucial step. Around 30 million years ago, shifting tectonic plates caused the land to stretch and break, creating the basin and the surrounding San Andres and Sacramento Mountains. The real transformation, however, began about 12,000 years ago at the end of the last Ice Age. As glaciers melted, water dissolved gypsum from the mountains and carried it into Lake Otero, a massive prehistoric lake that once filled the basin. When the lake dried up, it left behind large gypsum deposits, which weathered into selenite crystals. Over time, wind and water broke these crystals down into fine white sand, and strong southwest winds sculpted the shifting dunes we see today. White Sands is still evolving-wind moves the dunes up to 30 feet per year, constantly reshaping the landscape. Meanwhile, rare rainstorms briefly solidify the sand before the cycle begins again. This dynamic process makes White Sands one of the most geologically active dune systems in the world, a stunning natural wonder shaped by time, water, and wind.
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Nature & Wildlife
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