Horseshoe Bend is a great example of what in geology is termed an - TopicsExpress

Horseshoe Bend is a great example of what in geology is termed an incised meander, which is a sinuous loop in the Colorado River that has become deeply entrenched into the Navajo Sandstone that underlays it. A relic of the era millions of years past when the Colorado River flowed across a flat floodplain rather than through a 1000 foot (300 meter) deep canyon, Horseshoe Bend lies only a few miles downstream of the Glen Canyon Dam that impounds Lake Powell. As the Colorado Plateau experienced uplift to its current position, erosion in the river bed kept pace by cutting down, locking the river into an exact place for however many millions more years. The blue and green shades of the river are the result of cold, clear water being released from the bottom of Lake Powell at the dam. Under free-flowing natural conditions, the Colorado River would have been roughly the same shade of reddish-orange as the surrounding slickrock country. (Colorado is Spanish for red tinted, and there was a good reason for naming this river this way.) Historically the Colorado River used to carry one of the heaviest loads of suspended sediments in its water of any major river on earth, second only to the Yellow River of northern China. All of that sediment is now being trapped behind dams like Glen Canyon and Hoover. Eventually Lake Powell and Lake Mead will become giant mudflats as sediments fill the reservoirs. Its estimated that it may take only 700 or so years for Lake Powell to completely fill with silt. If you think thats a long time, it is not. There are churches in Europe three times that age, and the Egyptian Pyramids are 7 or 8 times older, so the eventual uselessness of Lake Powell to store water is entirely within the realm of future human history. (Assuming we dont burn ourselves off of this planet via warfare, climate change, or starvation before then....) Just some ponderings on the fleeting nature of my life relative to the tenacity of this ancient landscape.

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