19 April 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a contact between terrain which is completely mantled by a smooth-surfaced material -- perhaps dust -- and a rugged, cratered surface that is only partially dust-covered in the Noachis Terra region of Mars. The smooth-surfaced material likely once covered this entire scene, but has been slowly eroded away to reveal the underlying, older surface.
Location near: 27.8°S, 338.8°W
Image width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Summer