This image shows the northern rim of a crater in Deuteronilus. At the northern end, we see the crater rim and ridges inside and below that rim. A channel set is entering from the west and passing through a notch in a ridge. Topographically below that notch, overlapping lobes spread over the crater floor.

Fan-shaped lobes likes these are also in the desert southwest of the United States, and are called “alluvial fans.” They are caused when streams that carry sediment in a confined channel open up onto a plain or wide area, and deposit their sediment just outside of the channel mouth.

ID: ESP_044388_2160
date: 15 January 2016
altitude: 295 km

https://uahirise.org/hipod/ESP_044388_2160
NASA/JPL-Caltech/University of Arizona
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