HiPOD: 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.

More: https://uahirise.org/hipod/ESP_055307_2215
NASA/JPL-Caltech/UArizona
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