<p>Pitted Cones: Possible Methane Sources? — This observation shows relatively bright mounds scattered throughout darker and diverse surfaces in Chryse Planitia. These mounds are hundreds of meters in size. The largest of the mounds shows a central pit, similar to the collapsed craters found at the summit of some volcanoes on Earth. The origins of these pitted mounds or cratered cones are uncertain. They could be the result of the interaction of lava and water, or perhaps formed from the eruption of hot mud originating from beneath the surface.
</p><p>NASA/JPL/University of Arizona (302 km above the surface)
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Source: <a rel="nofollow" class="external text" href="https://www.uahirise.org/ESP_055307_2215">www.uahirise.org/ESP_055307_2215</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-08-10 15:00
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/42691611070/">ESP_055307_2215</a>