Meanders and Tributaries in Ridge Form in the Zephyria Region
NASA/JPL/University of Arizona
Meanders and Tributaries in Ridge Form in the Zephyria Region
ESP_024484_1750  Science Theme: Fluvial Processes
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This observation reveals two obvious features. The smaller, narrow ridges oriented vertically are yardangs, which are created by wind erosion; the wind strips away the surrounding terrain, and the ridges remain because they contain more hardened material.

The second feature—the inverted, meandering channel snaking through the image—is caused by similar processes. This was once a river bed that meandered due to changes in topography. As the river flowed, sediments were deposited on its floor, and over time, these sediments became hardened, so when the wind later stripped away the surrounding terrain, the hardened sediments remained, leaving an inverted form.

Written by: Dan Berman   (7 December 2011)

This is a stereo pair with ESP_024985_1750.

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Acquisition date
17 October 2011

Local Mars time:
14:26

Latitude (centered)
-5.100°

Longitude (East)
151.608°

Range to target site
269.6 km (168.5 miles)

Original image scale range
53.9 cm/pixel (with 2 x 2 binning) so objects ~162 cm across are resolved

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50 cm/pixel and North is up

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Equirectangular

Emission angle:
4.7°

Phase angle:
42.9°

Solar incidence angle
39°, with the Sun about 51° above the horizon

Solar longitude
16.4°, Northern Spring

North azimuth:
97°

Sub-solar azimuth:
24.0°
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Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.