Athabasca Valles Distributary Channels
Athabasca Valles Distributary Channels
PSP_010045_1880  Science Theme: Volcanic Processes
This observation shows small, branching channels that are part of the larger Athabasca Valles channel system.

These side channels are “distributaries” because they bifurcate from the main channel, which is located to the northwest of this image. The distributaries flowed from north to south when they were active.

Despite having pronounced topography, nearly all the terrain in this image is covered by a thin carapace of solidified lava. Long ago, the lava erupted from a fissure at the head of Athabasca Valles. It flooded this region and then receded, leaving behind only a thin coating. At higher elevations, the lava has a finely ridged but otherwise smooth texture, whereas on the floors of the distributary channels, it exhibits arcuate pressure ridges (that is, ridges formed by the compression, buckling and breaking of the lava flow surface) as well as a polygonal texture that bears a superficial resemblance to scaly reptile skin.

Small mounds and pitted cones dot the surface of the lava in the southern part of this HiRISE image. These are thought to be “rootless cones” that formed where steam explosions disrupted the lava flow.

Written by: Windy Jaeger  (12 November 2008)

This is a stereo pair with PSP_009768_1880.
Acquisition date
17 September 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
276.9 km (172.1 miles)

Original image scale range
29.6 cm/pixel (with 1 x 1 binning) so objects ~89 cm across are resolved

Map projected scale
25 cm/pixel and North is up

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Emission angle

Phase angle

Solar incidence angle
54°, with the Sun about 36° above the horizon

Solar longitude
128.4°, Northern Summer

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North azimuth:  97°
Sub-solar azimuth:  25.2°
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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.