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outwash

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outwash

Deposit of sand and gravel carried by running water from the melting ice of a glacier and laid down in stratified deposits. An outwash may be as much as 330 ft (100 m) thick at the edge of a glacier, and it may extend for many miles. Outwashes are the largest glacial deposits and provide a considerable source of windblown material.


outwash [′au̇t‚wäsh]
(geology)
Sand and gravel transported away from a glacier by streams of meltwater and either deposited as a floodplain along a preexisting valley bottom or broadcast over a preexisting plain in a form similar to an alluvial fan. Also known as glacial outwash; outwash drift; overwash.
Soil material washed down a hillside by rainwater and deposited on more gently sloping land.


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The researcher says that nearby Fountain Glacier seems more stable, but the outwash plain below it, a zone always coated in a thick layer of ice, even throughout the summer, was completely dry in the summer of 2008.
Valleys show little catenary (U-shaped) sculpturing and mountain spurs are not facetted; however, many of the valley bottoms are filled with till and outwash.
 
 
 
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