6 May 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a portion of a deep channel formed on the northern flank of the large volcano, Ascraeus Mons. Layers of volcanic rock are exposed in the channel walls, and the dark dots on the valley floor are boulders derived from erosion of these materials. The picture occurs near 14.5°N, 102.8°W, and is illuminated from the lower left. The picture covers an area about 3 km (1.9 mi) across.