Thirty square miles of the dunes stretch to the north, south and west. According to a park brochure, the dunes were formed thousands of years ago with sand and and sediment which washed down from both the San Juan as well as Sangre de Cristo mountain ranges. Prevailing southwesterly winds bounced the sand grains to pile them up beneath the Sangre de Cristo Mountains. Prevailing northeasterly winds through the mountain passes caused the sand to pile back up on themselves thus creating very large dunes. They are the largest in North America, some as high as 750 feet.
We hiked up to the nearest hill of dunes, it was a hard climb, and we felt it necessary to move fast as a storm was moving in. Climbing those hills was a lot harder than we had imagined, but it was fun running down-I did not care at all if I fell! Most fortunately it was overcast and cool. During the summer months the sand can be as hot as 150 degrees F.
One last item here. While hiking around the visitor's center I came upon the most exquisite plant with pale pink blooms on it. I learned from a park ranger that it is a desert verbena. According to him, what I thought of as flowers on it were instead the fruit or seeds of the plant.
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