How Did White Sands Form - Web geology of white sands. Web the gypsum dunes at white sands national monument are formed from pure white gypsum sand, which is unique. Web a source of gypsum the geologic story of white sands began 250 million years ago when earth’s continents were still joined in. The story of the world’s largest gypsum dunefield began 280 million years ago when the. Web long ago, an ancient sea covered most of the southwestern united states. It was during this time that layers.
Web long ago, an ancient sea covered most of the southwestern united states. The story of the world’s largest gypsum dunefield began 280 million years ago when the. It was during this time that layers. Web geology of white sands. Web a source of gypsum the geologic story of white sands began 250 million years ago when earth’s continents were still joined in. Web the gypsum dunes at white sands national monument are formed from pure white gypsum sand, which is unique.