in desert environments might be a clue to past liquid water activity and thus past habitability: https://mars.nasa.gov/resources/26108/aerial-view-of-jezero-craters-raised-ridges/

These ridges are part of an extended network of similar features that seem to predate the formation of the Jezero delta, since the delta remnants appear to have covered them on the crater floor. Knowing how they were formed would put pieces of Jezero's history puzzle into place. Hopefully some day the puzzle will be solved.
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