Layered Bedrock in Walls of Ganges Mensa
Layered Bedrock in Walls of Ganges Mensa
PSP_007376_1725  Science Theme: Sedimentary/Layering Processes
The full range of the image shows clear evidence for a thick series of bedrock layers along the walls of Ganges Mensa, located in the Ganges Chasma portion of the large Valles Marineris chasm system.

These layers are of relatively uniform thickness and can be followed over long distances. The walls have weathered into a series of ridges where the layers can be traced laterally across the topography. The depressions between the ridges are partially filled with wind-blown sediments that form distinct dune fields.

Written by: John Grotzinger  (19 March 2008)
Acquisition date
22 February 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
263.2 km (163.6 miles)

Original image scale range
26.8 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved

Map projected scale
25 cm/pixel and North is up

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Phase angle

Solar incidence angle
47°, with the Sun about 43° above the horizon

Solar longitude
35.3°, Northern Spring

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North azimuth:  98°
Sub-solar azimuth:  33.9°
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NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.