NASA's Mars Global Surveyor shows a wide, flat-floored trough flanked by several smaller, branching troughs in the Olympica Fossae region of Mars. Dark- and intermediate-toned slope streaks, created by dry avalanches of dust, occur on the trough walls.

11 June 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a wide, flat-floored trough flanked by several smaller, branching troughs in the Olympica Fossae region of Mars. Dark- and intermediate-toned slope streaks -- created by dry avalanches of dust -- occur on the trough walls.

Location near: 25.1°N, 113.8°W
Image width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Northern Winter

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