Eastern Valles Marineris Bedrock Stratigraphy and Falling Dunes
NASA/JPL/University of Arizona
Eastern Valles Marineris Bedrock Stratigraphy and Falling Dunes
PSP_010277_1650  Science Theme: Geologic Contacts/Stratigraphy
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This image shows a transect of approximately 8-kilometers of Coprates Chasma wall stratigraphy, which includes (moving down sequence): the southern plateau, wall spurs, fans of eroded material, gullies, sand dunes, and canyon floor.

Dunes located in the center left show slip faces on the downhill side and aligned with the local gradient, indicating down slope transport (see subimage, white arrow). These “falling dunes” are a type of topographically-controlled sand dune that formed when down-slope winds were focused by the gully topography. Although rare across Mars, eastern Coprates Chasma has an abundance of these falling dunes, particularly on north-facing walls.

As with all dunes, wind regime, sediment supply, topography, and climate are all important factors in where dunes form and persist. An abundant sand supply from local wall layer and persistent down-slope winds are likely contributors to why these dunes are so common here.

Note: the above image (and the subimage) are non map-projected, so north is approximately down).

Also take a look at the digital terrain map made with this image pair.

Written by: Matthew Chojnacki   (22 May 2013)

This is a stereo pair with PSP_010699_1650.

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Acquisition date:05 October 2008 Local Mars time:15:42
Latitude (centered):-14.693° Longitude (East):302.410°
Range to target site:264.5 km (165.3 miles)Original image scale range:52.9 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:8.8° Phase angle:56.3°
Solar incidence angle:63°, with the Sun about 27° above the horizon Solar longitude:137.1°, Northern Summer

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