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Gullies in Nirgal
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Caption:
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 28.6°S, 41.5°W. The image covers an area 3 km (1.9 mi) across and is illuminated by sunlight from the upper left.
Cataloging Keywords:
| Name | Value | Additional Values |
|---|---|---|
| Target | Mars | |
| System | ||
| Target Type | Planet | |
| Mission | Mars Global Surveyor (MGS) | |
| Instrument Host | Mars Global Surveyor | |
| Host Type | Orbiter | |
| Instrument | Mars Orbiter Camera (MOC) | |
| Detector | ||
| Extra Keywords | Dune, Grayscale, Water | |
| Acquisition Date | ||
| Release Date | 2003-11-05 | |
| Date in Caption | 2003-11-05 | |
| Image Credit | NASA/JPL/Malin Space Science Systems | |
| Source | photojournal.jpl.nasa.gov/catalog/PIA04845 | |
| Identifier | PIA04845 | |
