HiRISE monitors dune fields across Mars to track how they are changing. The mobile sand also cleans dust off of the bedrock in inter-dune areas, providing good views of the bedrock structures and colors.

Here we see subtle color differences between layers, and a dense network of fractures. The dunes, in contrast, are uniformly dark and relatively blue in enhanced color (really grey but less red than the bedrock, so they appear blue here).

ID: ESP_072530_1815
date: 15 January 2022
altitude: 272 km

https://uahirise.org/hipod/ESP_072530_1815
NASA/JPL-Caltech/University of Arizona
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