Pits and troughs in Arcadia quadrangle, as seen by HiRISE under HiWish program
Jim Secosky picked out a NASA image NASA/JPL/Arizona
2018-03-06
<a rel="nofollow" class="external free" href="http://hirise.lpl.arizona.edu/ESP_053805_2140">http://hirise.lpl.arizona.edu/ESP_053805_2140</a>