PIA04116: Martian Gullies
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  2048 x 3500 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-1163
 Full-Res TIFF:  PIA04116.tif (7.175 MB)
 Full-Res JPEG:  PIA04116.jpg (1.556 MB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

25 July 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.

Location near: 37.3S, 153.2W
Image width: width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Spring

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date:
2005-07-25