In a Context Camera image, it looks like there may be layers or a steep section at the base of the wall. Perhaps the floor fell from the loss of ground ice, making a steep, but short scarp along the bottom. There are also ring-mold craters in this area, so the ground is probably ice-rich.

ID: ESP_056865_2205
date: 13 September 2018
altitude: 293 km

https://uahirise.org/hipod/ESP_056865_2205
NASA/JPL-Caltech/UArizona
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