This 3D perspective view is a composite of both HiRISE and data from CRISM, another instrument onboard MRO. This view covers a small patch of ancient Martian real estate in Terra Sirenum.

CRISM collects spectral data that can be used as a chemical fingerprint for the upper most surface. This information suggests that this small patch of surface is covered with salts (chlorides) represented in green and water-rich clays that appear in blue.

CRISM colors can be added to high-resolution images to enhance our knowledge of these materials. They also match nicely with the surface features in our HiRISE image. For example, a fissure near the center of the image may be a a clue to the origin of the salts. The fissure may be a fracture where warm salt-laden water may have welled up, erupted and ponded on the surface. These waters then evaporated leaving the salt-rich deposits behind.

ID: PSP_005811_1470
date: 23 October 2007
altitude: 253 km

https://uahirise.org/hipod/PSP_005811_1470
NASA/JPL-Caltech/University of Arizona
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