An Inverted Crater – There is a circular feature in this observation that appears to stand above the surrounding terrain. How did it form? (<a rel="nofollow" class="external text" href="http://www.uahirise.org/ESP_043651_1590">www.uahirise.org/ESP_043651_1590</a>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2016-05-27 14:17
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/26810946734/">ESP_043651_1590</a>