Yardangs on Mars

Yardangs are common in some regions on Mars, especially in the Medusae Fossae Formation.

[2][3] Yardangs exhibit very few impact craters, indicating that the surface exposed is relatively young and the process of erosion may be active.

[4] The easily eroded nature of the Medusae Fossae Formation suggests that it is composed of weakly cemented particles, and was most likely formed by the deposition of wind-blown dust or volcanic ash.

A resistant caprock on the top of yardangs has been observed in Viking,[7] Mars Global Surveyor,[8] and HiRISE photos.

[9] Images from spacecraft show that they have different degrees of hardness probably because of significant variations in the physical properties, composition, particle size, and/or cementation.