Some of the crescent forms seem to be in strata that are below those that form the ridges in this area of Arabia Terra. However, perhaps they are banked against the ridges or maybe they compose the ridges. The crescentic forms might be a sign of wind-blown (aeolian) sandstone.

ID: ESP_063956_1860
date: 18 March 2020
altitude: 272 km

https://uahirise.org/hipod/ESP_063956_1860
NASA/JPL-Caltech/UArizona
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