NASA's Mars Global Surveyor shows house-sized boulders and layered volcanic rock exposed in a pit on the north flank of the giant Tharsis volcano, Ascraeus Mons on Mars. The pit most likely formed by collapse.

29 December 2005
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows house-sized boulders and layered volcanic rock exposed in a pit on the north flank of the giant Tharsis volcano, Ascraeus Mons. The pit most likely formed by collapse. Dust mantles much of the surrounding terrain and the pit floor.

Location near: 12.9°N, 101.6°W
Image width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Southern Winter

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