Many layers are visible in the walls of Aurorae Chaos. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers.
A detailed discussion of layering with many Martian examples can be found in Sedimentary Geology of Mars.
Wide view of layers in wall of Aurorae Chaos, as seen by HiRISE under HiWish program
Close view of layers from previous image, as seen by HiRISE under HiWish program
Close view of layers from a previous image, as seen by HiRISE under HiWish program Box shows the size of football field.
Close view of layers from a previous image, as seen by HiRISE under HiWish program
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