File:Gullies on crater wall.jpg

English: Gullies in crater. NASA wrote the following caption for this image of gullies: The banked, sinuous shape of the gully channels suggest that water was involved in their formation. The source of this water however is a subject of debate. Hypotheses include melting of snow or near-surface ground ice.

Other features also suggest the past (and possibly present) presence of snow or ground ice in this region. For example, the “mantle” deposit on the crater wall displays polygonal fractures. Polygons on Earth are associated with periglacial activity. This refers to processes that occur from the presence of ground ice, which interacts with surface and subsurface materials, as well as the Martian atmosphere as a function of climate and seasons). The mantle itself may be the remains of a dusty snowpack deposited in Mars’ recent past.

At the base of the mantle are fractures associated with the slumping of these deposits under their own weight and Martian gravity. The largest gullies cut into these mantling deposits, and in some places obscure the underlying fractures at the base of the crater wall. This indicates that the largest gullies are younger than both the mantle and the fractures.

Written by: Livio Tornabene, Tanya Harrison, Elizabeth Silber, and Kayle Hansen (narration: Tre Gibbs) (29 July 2015)