Great San Dunes National Monument

On the eastern side of the remote, high-mountain San Luis Valley, between the Blanca Massif and Crestone Needle, are the Great Sand Dunes, the tallest sand dunes in North America. The dunes cover approximately 39 square miles and rise to almost 750' above the valley floor. The dunes were formed from sand deposited by the Rio Grande river and its tributaries, which flow through the San Luis Valley. For thousands of years, prevailing westerly winds have come over the Rockies and down over the river flood plain, picking up sand particles on the way. These are then deposited at the east edge of the valley before the wind rises to cross the Sangre de Cristo mountains. The process continues and the dunes are still being gradually enlarged by the wind, which also changes the shape and sand patterns of the dunes daily. In some places, patches of black sand are found caused by deposits of magnetite, a crystalline black oxide of iron.
                                                   
 

Home
Vacation 2001

Four Corners
Between Four Corners and Cortez
Durango Silverton Railroad
Mesa Verde National Monument
Stations Of The Cross
San Luis From Stations Of The Cross
Great Sand Dunes National Monument
River Rafting, Pilar, NM
Pikes Stockade
Rock On Our Property
San Luis Valley
Wolf Creek Pass

 

 

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Email to contact us is: george@eaglefreeenterprise.com
 

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