alluvial cone

alluvial fan

noun Physical Geography.
a fan-shaped alluvial deposit formed by a stream where its velocity is abruptly decreased, as at the mouth of a ravine or at the foot of a mountain.
Also called alluvial cone.


Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
alluvial fan or alluvial cone
 
n
a fan-shaped accumulation of silt, sand, gravel, and boulders deposited by fast-flowing mountain rivers when they reach flatter land
 
alluvial cone or alluvial cone
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
alluvial fan   (ə-l'vē-əl)  Pronunciation Key 
A fan-shaped mass of sediment, especially silt, sand, gravel, and boulders, deposited by a river when its flow is suddenly slowed. Alluvial fans typically form where a river pours out from a steep valley through mountains onto a flat plain. Unlike deltas, they are not deposited into a body of standing water.
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