In the heavily cratered southern highlands, repeated wind erosions
and depositions could create the greatly eroded landscape seen in
Figure 5.10. This frame is about 43 km across.
An aeolian surface on Mars sometimes can also appear as an etched
surface as indicated in Figure 5.11. In addition, wind eroded parallel
ridges, called yardang on Earth, can also be found on Mars (Figure
For a comparison, yardangs of the Iranian desert on Earth as observed
from LandSat photos are shown in Figure 5.13. Notice the linear
features between this image and that of the previous image. A picture
of the geology in this area as observed from a low-altitude airplane
is given in Figure 5.14. Indeed, the linear features in Figure 5.12
are likely yardangs that resemble inverted keels of sailboats that
are arranged parallel to each other.