<p>Flow with a Double Ridge — The objective of this observation is to confirm a trimline (a higher level for a glacier) in a flow coming out of a valley in a mesa. If this is indeed a trimline, then the glacier could have been far higher in the past. That may mean that conditions for glaciers existed over a long time period.
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NASA/JPL/University of Arizona (Acquired: Feb 2017, approximately 297 km above the surface. <a rel="nofollow" class="external text" href="https://www.uahirise.org/ESP_049371_2175">www.uahirise.org/ESP_049371_2175</a>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2017-07-04 15:31
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/34969754253/">ESP_049371_2175</a>