Possible ring-mold craters in Elysium 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_053981_2090">http://hirise.lpl.arizona.edu/ESP_053981_2090</a>