Light-Toned Layered Deposits on Southern Mid-Latitude Crater Floor
NASA/JPL/University of Arizona

Light-Toned Layered Deposits on Southern Mid-Latitude Crater Floor
ESP_011310_1395  Science Theme: Sedimentary/Layering Processes
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This image features the floor of a crater in the Southern highlands of Mars.

The light-toned layered deposits (LTLD) are located in the center of the image; they are exposed along the edges of the high-standing mesa. LTLD are found in many places on Mars, including impact craters and canyons near the equator. They may have been deposited by sedimentary processes involving wind and/or water.

Dunes or ripples surround the mesa. The orientation of the dunes indicates that the direction of the dominant wind at the time of the dune/ripple formation was along the troughs that surround the mesa.

The terrain near the bottom of the image has a texture that geologists call "etched." The etched texture is a result of differential erosion as some materials being eroded more easily than others. One possible scenario is that the region was buried by a soft sedimentary deposit that is now being removed by wind erosion.

Written by: Kelly Kolb   (15 April 2009)

This is a stereo pair with ESP_011811_1395.

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Acquisition date:24 December 2008 Local Mars time: 3:57 PM
Latitude (centered):-40.129° Longitude (East):182.060°
Range to target site:253.4 km (158.3 miles)Original image scale range:25.3 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:2.3° Phase angle:69.3°
Solar incidence angle:67°, with the Sun about 23° above the horizon Solar longitude:179.5°, Northern Summer
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North azimuth:96° Sub-solar azimuth:25.9°
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North azimuth:270°Sub solar azimuth:201.0°

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