NASA's Mars Global Surveyor shows dark sand dunes overlying an eroded, layered substrate in Chasma Boreale, amid the materials of the martian north polar cap.

9 February 2005
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows dark sand dunes overlying an eroded, layered substrate in Chasma Boreale, amid the materials of the martian north polar cap.

Location near: 84.5°N, 358.3°W
Image width: ~3.0 km (~1.9 mi)
Illumination from: lower left
Season: Northern Summer

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