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This image shows a set of coalesced collapse pits in western Valles Marineris.

Fine layers are exposed in the walls of the pits, and in some places those layers are displaced by faults. What formed these layers, and what caused them to collapse into pits? Detailed study of this image and other data should help answer those questions.

This is a stereo pair with ESP_044982_2670.

The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.