Triangular shaped deposits at cliff edges are termed alluvial fans. Alluvial fans typically form in arid regions were water flow is limited, so deposits of material are not washed away as seen by NASA 2001 Mars Odyssey spacecraft.
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Details
Title: Alluvial Fans
Creator: NASA/JPL-Caltech/ASU
Date Created: 2014-04-30
Rights: JPL
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