This very fuzzy photo is the latest released by NASA of the rover Curiosity's ridge-walking trip.
Still no caves found, nor much of anything that the general public would be enthusiastic about. However, if you zoom in to the cracks of each rock, you can see thousands of years of erosion by a variety of forces. Probably from sandstorms, heating and cooling, and maybe even some find of chemical erosion, and maybe even a liquid compound from a eon or even eons ago.
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