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canvas prints space canvas prints black and white canvas prints landscape canvas prints rock canvas prints layers canvas prints bedrock canvas prints deposits canvas prints topography canvas prints geography canvas prints ravine canvas prints gully canvas prints territory canvas prints wall canvas prints crater canvas prints terrain canvas prints

photographs space photos black and white photos landscape photos rock photos layers photos bedrock photos deposits photos topography photos geography photos ravine photos gully photos territory photos wall photos crater photos terrain photos

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July 25, 2005 - This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a gullied crater wall in the Terra Sirenum region of Mars. The fluids that formed the gully channels and deposited debris in aprons at the base of the crater wall may have percolated through layers in the layered bedrock exposed in the crater wall. As fluid seeped out of the ground, it undermined overlying layers of rock, and caused the formation of several compex alcoves, higher in the crater wall. The formation of alcoves requires the undermining and collapse of layered material at a point where the channel begins; this is a key observation supporting the hypothesis that martian gullies require groundwater, not snowmelt or other exotic processes or fluids, to form.