Features of Noachis Terra (Original NASA/MGS/MSSS b/w Frame)

Caption NASA Originale:"This MGS-MOC image shows the edge of a trough, which is part of a large pit crater complex in Noachis Terra. This type of trough forms through the collapse of surface materials into the subsurface and often begins as a series of individual pit craters. Over time, continued collapse increases the diameter of individual pits until finally, adjacent pits merge to form a trough such as the one captured in this image. The deep shadowed area is caused in part by an overhang; layered rock beneath this overhang is less resistant to erosion, and thus has retreated tens of meters backward, beneath the overhang. A person could walk up inside this "cave" formed by the overhanging layered material".

Location near: 47,0° South; 355,7° West
Image width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern Summer