The reason for their existing here is due to wind and erosion. The wind carries fine sand particles derived from the tall mountains to the west. But when that wind hits the tall Sangre de Cristo Range they are forced up and lose their ability to carry the fine sediment. Over millennia the process has formed this astonishing landscape featuring dunes rising over 750 feet above the valley floor. This unique feature of American geology is now a National Park. The golden light of the low angled setting sun highlighted the crests and curves of these towering dunes for the presentation of this wonderful geologic phenomenon.
This landscape mural is part of my "West By Southwest - An American Mural Project" collection. Like all of the others in the collection it is formatted in the 3:5 ratio and are only available in the 20" x 12", 24" x 14.375", 30" x 18", 40" x 24", 48" x 28.75", and 60" x 36" sizes, also 72" X 43.25" as a massive wall mural with astonishing clarity. Please see the collection for further information.
Source : https://pixels.com/featured/great-sand-dunes-mural-douglas-taylor.html226