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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Mosca in Alamosa County, Colorado — The American Mountains (Southwest)
 

The Mountain Barrier

 
 
The Mountain Barrier Marker image. Click for full size.
By Don Morfe, September 1, 2008
1. The Mountain Barrier Marker
Inscription.
Mountains and passes were important in the formation
of the sand dunes.

You are looking at the Sangre de Cristo Mountains. Prevailing southwesterly winds carrying sand across the San Luis Valley were blocked by the mountains.

As the winds rose to sweep through the passes, sand was dropped.

Some storms come from the northeast and reverse the wind flow through the passes, blowing sand back toward the Dune field.
 
Erected by National Park Service-United States Department of the Interior.
 
Location. 37° 43.992′ N, 105° 30.756′ W. Marker is in Mosca, Colorado, in Alamosa County. Marker can be reached from Highway 150. Click for map. The marker is located on the back porch of the Great Sand Dunes Visitor Center. Marker is at or near this postal address: 11999 Highway 150, Mosca CO 81146, United States of America.
 
Other nearby markers. At least 5 other markers are within 4 miles of this marker, measured as the crow flies. Sangre de Cristo Ecosystem (within shouting distance of this marker); Zebulon Pike's "sand-hills" (approx. 0.2 miles away); Stepping into Wilderness (approx. half a mile away); A Landmark for People
The Mountain Barrier image. Click for full size.
By Don Morfe, September 1, 2008
2. The Mountain Barrier
(approx. 2.2 miles away); "Totally Unique and Unexpected" (approx. 3.2 miles away).
 
Categories. EnvironmentNatural Features
 
The Mountain Barrier image. Click for full size.
By Don Morfe, September 1, 2008
3. The Mountain Barrier
Sand Dune Formation image. Click for full size.
By Don Morfe, September 1, 2008
4. Sand Dune Formation
Dunes form in response to wind patterns and sand supply. The high dunes you see are Reversing Dunes. The lower dunes near the creek are Barchan and Reversing Dunes. The Star Dunes are located on the far side of the Dune field.
Sand Dune Formation image. Click for full size.
By Don Morfe, September 1, 2008
5. Sand Dune Formation
Sign at the entrance to the park image. Click for full size.
By Don Morfe, September 1, 2008
6. Sign at the entrance to the park
 
 
Credits. This page originally submitted on , by Don Morfe of Baltimore, Md 21234. This page has been viewed 414 times since then and 11 times this year. Photos:   1, 2, 3, 4, 5, 6. submitted on , by Don Morfe of Baltimore, Md 21234. • Syd Whittle was the editor who published this page. This page was last revised on June 16, 2016.
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