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T01381
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Ref :
T01381
Theme :
Looking at Earth - Faults
(69 images)
Title :
San Luis Valley, South-Central Colorado, U.S.A. June 1991
Caption :
In semiarid San Luis Valley, relatively isolated in south-central Colorado between the Sangre de Cristo Mountains to the east and the San Juan Mountains to the west, farmers use center-pivot irrigation (indicated by circular patterns) in hundreds of fields. Most of the circular irrigated fields are less than a mile (kilometer) in diameter. A variety of crops, such as lettuce, alfalfa, field peas, oats, and potatoes, is grown in this remote valley. Some cattle and sheep are also raised for local and distant markets. The farming community of Alamosa (not visible at this scale) is located slightly south of the center of the photograph where the Rio Grande makes its gradual turn southeast. The average elevation of the valley is 7500 feet (2300 meters) above sea level; several peaks in the Sangre de Cristo Mountains exceed 13 000 feet (3950 meters). The dendritic, highly reflective surfaces in the northern part of the valley show a well-developed, intermittent stream flow pattern. Although the headwaters of the Rio Grande are in the San Juan Mountains, the lack of vegetation (darker areas), except in cultivated fields, on some mountain slopes, and in some drainage features, confirms the general lack of moisture throughout this semiarid subregion of the Rocky Mountains. The Great Sand Dunes National Monument is visible (slightly northeast of photograph center) along the western flank of the Sangre de Cristo Mountains.
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