PIA04656: Stair-stepped Mound
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: 540 x 810 pixels (width x height)
Produced By: Malin Space Science Systems
Full-Res TIFF: PIA04656.tif (425.7 kB)
Full-Res JPEG: PIA04656.jpg (56.73 kB)

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:
MGS MOC Release No. MOC2-429, 22 July 2003

This April 2003 Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a stair-stepped mound of sedimentary rock (right of center) on the floor of a large impact crater in western Arabia Terra near 11.0N, 4.4W. Sedimentary rock outcrops are common in the craters of this region. The repeated thickness and uniformity of the layers that make up this mound suggest that their depositional environment was one in which cyclic or episodic events occurred over some period of time. The sediments might have been deposited in a lake, or they may have settled directly out of the atmosphere. Most of the layered material was later eroded away, leaving this circular mound and the other nearby mesas and knobs. The image is illuminated by sunlight from the lower left.

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date:
2003-07-24