Yardangs are composed of sand grains that have clumped together and have become more resistant to erosion than their surrounding materials. They also serve as a useful indicator of the prevailing wind direction.

ID: ESP_055628_1895
date: Saturday, 9 June 2018
altitude: 275 km (170.5 mi)

https://uahirise.org/hipod/ESP_055628_1895
NASA/JPL-Caltech/University of Arizona
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