Gully Grab Bag in Crater Wall, Terra Sirenum Region
NASA/JPL-Caltech/UArizona
Gully Grab Bag in Crater Wall, Terra Sirenum Region
PSP_002291_1335  Science Theme: Fluvial Processes
This observation shows the complex, gullied western wall of a kilometer-deep impact crater in the Terra Sirenum region. This is an interesting crater because it appears to be mantled by the fluidized ejecta blanket of a slightly smaller crater just to the West.

A diverse set of gullies originate at multiple elevations along the crater wall. Prominent gullies have incised through the overlying ejecta into the upper walls to reveal numerous resistant dark layers. The floors of these gullies display a host of interesting features, including braided middle reaches, cut banks, channel bars, and stream terracing. These are all features suggestive of water flow.

Miniature gully systems, less than a kilometer long, start much further downslope than the larger gullies yet display the usual gully attributes, including theater-headed alcove source regions, incised middle reaches, and overlapping alluvial fans at their lower reaches. Detailed studies of these and other gully systems should help to elucidate the gully formation mechanisms.


Written by: Ginny Gulick  (14 February 2007)

This is a stereo pair with PSP_002212_1335.
 
Acquisition date
21 January 2007

Local Mars time
15:41

Latitude (centered)
-46.259°

Longitude (East)
184.455°

Spacecraft altitude
250.8 km (155.9 miles)

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54.4 cm/pixel (with 2 x 2 binning) so objects ~163 cm across are resolved

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50 cm/pixel and North is up

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Emission angle
23.6°

Phase angle
90.1°

Solar incidence angle
70°, with the Sun about 20° above the horizon

Solar longitude
170.7°, Northern Summer

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North azimuth:  95°
Sub-solar azimuth:  35.8°
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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.