Deeply Incised Gullies on Massif Slope in Nereidum Montes
Deeply Incised Gullies on Massif Slope in Nereidum Montes
PSP_009156_1335  Science Theme: Mass Wasting Processes
These gullies are in the Nereidum Montes near the large Argyre Basin in the southern hemisphere. Downslope, the gullies interact with other features. Some of the gully debris aprons cross a trough that lines the slope base. The debris aprons cover dunes lying in the trough, which indicates that both the dunes and trough were there before the gully activity.

The north half of the image is covered in boulders and some linear features that might have resulted from boulders tumbling or being dragged around. The south half of the image features gullies, which are thought to be fluvial features.

Beyond the trough there is a wavy ridge. The ridge has some landslides off of it that have extended onto nearby dunes.

Written by: Kelly Kolb  (3 September 2008)
Acquisition date
09 July 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
251.6 km (156.4 miles)

Original image scale range
50.5 cm/pixel (with 2 x 2 binning) so objects ~151 cm across are resolved

Map projected scale
50 cm/pixel and North is up

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Emission angle

Phase angle

Solar incidence angle
86°, with the Sun about 4° above the horizon

Solar longitude
96.5°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  49.0°
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Black & white is 5 km across; enhanced color about 1 km
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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.