Gullies and Layers in a Crater near Mariner Crater
Gullies and Layers in a Crater near Mariner Crater
ESP_039555_1430  Science Theme: Fluvial Processes
Gullies are commonly found in the southern mid-latitudes of Mars. In this image they start near top of a long ridge, and descend into an impact crater that lies at the bottom of the ridge, moving through a rocky layer along the way. Below the layer, the surface is dark and blue in HiRISE enhanced color, suggesting that it is easily erodible sand coating the crater wall.

The topography here is also interesting. There are two main features, an impact crater and a long trough called a graben, formed when the surface drops down between two faults. The eastern side of the crater is clearly cut by faulting, distorting the circular shape. On the north side, the crater rim is below the top of the graben fault. The crater could have dropped into the trough as it formed, but it is also possible that the trough partially formed before the crater and continued to widen later.

Written by: HiRISE Science Team (narration: Tre Gibbs)  (11 March 2015)
Acquisition date
03 January 2015

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
251.3 km (156.2 miles)

Original image scale range
25.2 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

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25 cm/pixel and North is up

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Solar incidence angle
41°, with the Sun about 49° above the horizon

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265.2°, Northern Autumn

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North azimuth:  96°
Sub-solar azimuth:  7.9°
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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.