HiRISE (NASA)
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HiRISE 4K: Layering in the Upper Walls of Valles Marineris

The layers, exposed in most rock outcrops in this image, are most likely lava flows from flood lavas that once erupted across the region. Full cutout on Flickr: flic.kr/p/2puaQv4

NASA/JPL-Caltech/UArizona

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