Crater with Gullies on a Central Structure
Crater with Gullies on a Central Structure
ESP_025082_2295  Science Theme: Glacial/Periglacial Processes
The 40-kilometer diameter unnamed crater in this image is located west of Lyot Crater and north of Deuteronilus Mensae in the northern plains of Mars.

As we see in the cutout, gully systems in the central structure have eroded underlying layers that are less resistant to erosion than the surface rock. Previous channelized water flows likely transported the eroded sediments toward the southeast and deposited them forming the expansive debris aprons.

The formation of channels on the debris aprons supports the hypothesis that these sediments were transported down the gullies and then deposited onto the aprons by flowing water. In the larger, northernmost system, sediments have partially filled in the channel segments and winds have remobilized these sediments forming the dunes that line the gullies.

Written by: Ginny Gulick  (1 February 2012)

This is a stereo pair with PSP_009298_2295.
Acquisition date
02 December 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
305.2 km (189.7 miles)

Original image scale range
33.6 cm/pixel (with 1 x 1 binning) so objects ~101 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
48°, with the Sun about 42° above the horizon

Solar longitude
38.0°, Northern Spring

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  330.3°
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IRB color
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non-map           (406MB)

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RGB color
non map           (397MB)
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Full resolution JP2 download
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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.