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Mechanical or Physical Weathering Gallery


Whereas alluvium is sediment that has been handled by running water, colluvium has not. (more below)
Mixed slope slop

Glenwood Springs, Colorado

Photo (c) 2010 Andrew Alden, licensed to About.com (fair use policy)
Colluvium is sediment that has moved downhill to the bottom of the slope without the help of running water in streams. Gravity, in the form of soil creep, and sheetwash during rain storms are the predominant agents. These yield an unsorted sediment of all particle sizes, ranging from boulders to clay, and relatively little abrasion to round the particles.
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