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Cathedral Gorge SP, alluvial fan, water erosion, photo
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Alluvium

Cathedral Gorge

Alluvial fans, the triangle-shaped deposit of alluvium—gravel, sand, and even smaller pieces of sediment, such as silt—are usually created as flowing water interacts with mountains, hills, or the steep walls of canyons as here in Cathedral Gorge. Photo © copyright by Robert Faucher.

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