In this <a rel="nofollow" class="external text" href="http://static.uahirise.org/images/2017/details/cut/ESP_047762_1585.jpg">context image</a> is an old degraded crater that has undergone a complex history of burial and erosion. The image shows a surface with at least two types of exposed bedrock, one that is light-toned and one that is dark. An <a rel="nofollow" class="external text" href="http://static.uahirise.org/images/2017/details/cut/ESP_047762_1585-2.jpg">enhanced color infrared image</a> highlights these two exposures in yellows and blues, which such colors representing altered and unaltered surfaces, respectively.
<p>The overlying, rougher blueish-toned bedrock appears to have undergone the most extensive erosion, revealing the smoother, fractured yellowish-toned bedrock below. We see windblown (aeolian) bedforms across the image, possibly the culprit behind the erosive forces that have removed and uncovered the underlying yellowish-toned bedrock visible today.
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The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace &amp; Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.
NASA/JPL-Caltech/Univ. of Arizona
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