White Sands National Park is an American national park located in the state of New Mexico and completely surrounded by the White Sands Missile Range. The park covers in the Tularosa Basin, including the southern 41% of a field of white sand dunes composed of gypsum crystals. This gypsum dunefield is the largest of its kind on Earth, with a depth of about , dunes as tall as , and about 4.5 billion short tons (4.1 billion metric tons) of gypsum sand. Approximately 12,000 years ago, the land within the Tularosa Basin featured large lakes, streams, grasslands, and Ice Age mammals. As the climate warmed, rain and snowmelt dissolved gypsum from the surrounding mountains and carried it into the basin. Further warming and drying caused the lakes to evaporate and form selenite crystals. Strong winds then broke up crystals and transported them eastward. A similar process continues to produce gypsum sand today. Thousands of species of animal inhabit the park, a large portion of which are invertebrates. Several animal species feature a white or off-white coloration. At least 45 species are endemic, living only in this park, with 40 of them being moth species. The Tularosa Basin has also seen a number of human inhabitants, from Paleo-Indians 12,000 years ago to modern farmers, ranchers, and miners. White Sands National Park was originally designated White Sands National Monument on January 18, 1933 by President Herbert Hoover; it was redesignated as a national park by Congress and signed into law by President Donald Trump on December 20, 2019. It is the most visited NPS site in New Mexico, with about 600,000 visitors each year. The park features a drive from the visitor center to the heart of the dunes, picnic areas, backcountry campground in the dunefield, marked hiking trails, and sledding on the dunes. Ranger-guided orientation and nature walks occur at various times and months throughout the year. History Native people A fossil trackway of footprints of humans and ground sloths found at White Sands shows that ground sloths were hunted by humans during the Last Glacial Maximum. The potentially oldest known human footprints in North America were found at White Sands by researchers who identified approximately 60 fossilized footprints buried in layers of gypsum soil on a large playa in the Tularosa Basin. Multiple human footprints are stratigraphically constrained and bracketed by seed layers that yield calibrated radiocarbon ages between 23