Figure: Alluvial Fans

Alluvial Fans are common on Mars.

Credit: Martian Deltas and the Origin of Life, by Janok P. Bhattacharya1, (Search and Discovery Article #40203, 2006) and
NASA/JPL/Arizona State University.

http://www.searchanddiscovery.net/documents/2006/06058bhattacharya/index.htm