Colluvium is a general name for loose, unconsolidated sediments that have been deposited at the base of hillslopes by either rainwash, sheetwash, slow continuous downslope creep, or a variable combination of these processes. Colluvium can be composed of often a heterogeneous range of sediments ranging from silt to rock fragments of various sizes. ...
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http://en.wikipedia.org/wiki/Colluvium
Mixed deposits of soil material and rock fragments near the base of steep slopes. Deposits accumulate through soil creep, slides, and local wash.
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http://www.americantrails.org/
(from the article `river`) When sediment eroded from the hillslopes is not delivered directly to a channel, it may accumulate at the base of the slope to form a colluvial ...
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http://www.britannica.com/eb/a-z/c/110
Material that accumulates at the foot of a steep slope by rainwash, sheetwash, or slow continuous downslope creep.
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http://www.scientificpsychic.com/etc/geology-glossary.html
loose earth material that has accumulated at the base of a hill, through the action of gravity, as piles of talus, avalanche debris, and sheets of detritus moved by soil creep or frost action.
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https://www.infoplease.com/dictionary/colluvium
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