This enhanced-colour image from March 2012 of a region of Mars near Nili Fossae shows part of the ejecta from an impact crater and contains some of the best exposures of ancient bedrock on Mars.
The impact broke up already diverse rocks types and mixed them together to create this wild jumble of colours, each representing a different type of rock.
Carbonates are commonly formed on Earth by marine organisms; the origin of these carbonates on Mars is unknown, but probably involved liquid water.
This image was taken along with the CRISM instrument, also onboard the Mars Reconnaissance Orbiter (MRO), in what is called "ridealong" mode.
This image was taken along with the CRISM instrument, also onboard the Mars Reconnaissance Orbiter (MRO), in what is called "ridealong" mode.
This image was taken by the Mars Reconnaissance Orbiter's HiRISE camera.
Image Credit: NASA/JPL-Caltech/University of Arizona
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