HiRISE: Evolution of gully features in Acidalia Planitia

ESP_052432_2325This observation captures details regarding the evolution of gully features observed in a crater in Acidalia Planitia.

A Context Camera image provides context for these gullies showing an approximately 7-kilometer diameter crater in which we see that the gullies occur exclusively on the northern wall. This is unlike most of the observed gully sites in the northern Martian hemisphere, which typically have gullies on their pole-facing slopes. Another unique observation of this set of gullies is that they start mid-way down the crater’s wall rather than cutting directly into the upper crater wall or rim. [More at link]

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