<p>Curving Ridges and Pits
</p><p>This terrain is unusual for the South Polar region of Mars, with a set of curved ridges of unknown origin. 
</p><p>Small pits are present, often concentrated on the ridges, that may have resulted from sublimation of ice. 
</p><p>NASA/JPL/University of Arizona
</p>
Source: <a rel="nofollow" class="external text" href="https://www.uahirise.org/ESP_056311_0940">www.uahirise.org/ESP_056311_0940</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-10-19 17:04
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/45656353381/">ESP_056311_0940</a>