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Recent investigations by the U. S. Geological Survey indicate that approximately two billion tons of sediment have accumulated in Lake Mead during its first 14 years from 1935 to 1948, inclusive. About 50 per cent of this material has been transported by turbidity currents which form at the mouths of the Colorado and Virgin Rivers. The sediment carried by the Colorado turbidity currents has been deposited along the bottom of the entire length of the lake, a distance of 120 miles, whereas the material supplied by the Virgin River turbidity currents is confined chiefly to the northern part of the inundated Virgin River valley (Overton Arm of Lake Mead). A review of the nature and history of the Lake Mead turbidity currents is presented and consideration is given to the possible applications that these studies may have to similar sedimentary processes in the ocean.

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