This <a rel="nofollow" class="external text" href="http://static.uahirise.org/images/2017/details/cut/ESP_021716_1685.jpg">enhanced-color image</a> shows a small portion of a dark crater floor in the Tyrrhena Terra region of Mars. This is largely ancient hard bedrock that has been cratered by numerous impacts over the eons.
<p>Two other interesting geological features in Tyrrhena Terra (not pictured here): Herschel Crater and Tyrrhena Patera, one of the oldest volcanoes on Mars.
</p>
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
<b><a rel="nofollow" class="external text" href="https://photojournal.jpl.nasa.gov/catalog/PIA11179">Catalog page</a></b><span style="white-space:nowrap"> <b>·</b></span> Full-res (<a rel="nofollow" class="external text" href="https://photojournal.jpl.nasa.gov/jpeg/PIA11179.jpg">JPEG</a><span style="white-space:nowrap"> <b>·</b></span> <a rel="nofollow" class="external text" href="https://photojournal.jpl.nasa.gov/tiff/PIA11179.tif">TIFF</a>)