HiRISE: Pitted material and mounds

tumblr_phl738286R1rlz4gso2_1280Pitted material and mounds in Chryse Planitia. This rough-looking material has many meter-length pits. What exactly is this stuff? Chryse Planitia shows evidence of water erosion in the past, and is the bottom end for many outflow channels from the southern highlands as well as from Valles Marineris and the flanks of the Tharsis bulge.

Beautiful Mars series. [More at links]

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