This May 22, 2015, view from the Mast Camera (Mastcam) in NASA's Curiosity Mars rover shows the "Marias Pass" area where a lower and older geological unit of mudstonethe pale zone in the center of the imagelies in contact with an overlying geological unit of sandstone.
In detective stories, as the plot thickens, an unexpected clue often delivers more questions than answers.
From Jet Propulsion Laboratory/NASA
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