This image from NASA's Mars Global Surveyor shows a group of tapered ridges, known as yardangs, which formed by wind erosion of a relatively easily-eroded material, most likely sedimentary rock or volcanic ash deposits.

12 January 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a group of tapered ridges, known as yardangs, which formed by wind erosion of a relatively easily-eroded material, most likely sedimentary rock or volcanic ash deposits containing some fraction of sand-sized grains.

Location near: 6.1°S, 210.8°W
Image width: ~2 km (~1.2 mi)
Illumination from: lower left
Season: Southern Summer

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