Last modified on 9 December 2007, at 07:56

Alluvial fan

Alluvial fan.jpg
An alluvial fan is a fan-shaped pile of sediment that forms where a rapidly flowing mountain stream enters a relatively flat valley. As water slows down, it deposits sediment (alluvium) that gradually builds a fan.[1]

References

  1. http://wrgis.wr.usgs.gov/docs/parks/misc/glossaryAtoC.html