Northern dunes are made of dark basaltic sand, causing them to stand out against the rougher redder surface. No seasonal carbon dioxide ice remains other than the few bright cold spots where the ice (which may be water ice) has been protected.

ID: ESP_079927_2550
date: 15 August 2023
altitude: 318 km

https://uahirise.org/hipod/ESP_079927_2550
NASA/JPL-Caltech/University of Arizona
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