Multi-Elevation Gullies
NASA/JPL/University of Arizona
Multi-Elevation Gullies
ESP_057450_1410  Science Theme: Mass Wasting Processes
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Gullies probably formed along the bouldery layers in the upper slopes of this unnamed crater within the last few million years. Gullies eroded these crater slopes and transported sediment downslope forming debris aprons multiple times.

These older apron surfaces were cut by numerous fractures running perpendicular to the slope. Subsequent episodes of gully activity eroded through these fractures and deposited new aprons.

On the floor of the crater are ridges with bouldery layers. These ridges may mark the furthest extent of glaciers that predate much of the original gully activity. Bright flows continue to form in these gullies seasonally.

In the upper gully regions, long shadows cast by jagged outcrops allow scientists to determine the heights and depths of landforms by measuring the length of the shadows cast by the ridges onto the gully floor.

Written by: Ginny Gulick (audio: Tre Gibbs)  (22 January 2019)
 
Acquisition date
28 October 2018

Local Mars time
14:37

Latitude (centered)
-38.648°

Longitude (East)
168.828°

Spacecraft altitude
251.5 km (156.3 miles)

Original image scale range
25.2 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
35.9°

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

Solar longitude
277.9°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  16.6°
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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

POSTSCRIPT
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.