PIA04845: Gullies in Nirgal
Target Name: Mars
Is a satellite of: Sol (our sun)
Mission: Mars Global Surveyor (MGS)
Spacecraft: Mars Global Surveyor Orbiter
Instrument: Mars Orbiter Camera (MOC)
Product Size: 603 x 904 pixels (width x height)
Produced By: Malin Space Science Systems
Full-Res TIFF: PIA04845.tif (545.9 kB)
Full-Res JPEG: PIA04845.jpg (103.3 kB)

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Original Caption Released with Image:
MGS MOC Release No. MOC2-535, 5 November 2003

This is a Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) narrow angle image of gullies carved into debris on the south-facing wall of Nirgal Vallis, an ancient martian valley. The gullies were conduits for sediment that has accumulated at a point where each channel met the valley floor. The aprons of debris are superposed upon the large ripple-like dunes, suggesting that the gullies are younger than these bedforms. Gullies such as these might have been formed by a liquid, such as water, seeping from the layered bedrock exposed in the valley wall, or perhaps by mass movement of the smooth-surfaced debris that covers much of the lower two-thirds of the valley wall. This picture is located near 28.6S, 41.5W. The image covers an area 3 km (1.9 mi) across and is illuminated by sunlight from the upper left.

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date:
2003-11-05