The lower right side of the image shows a part of Caralis Chaos. As spectroscopic observations indicate, the knobby and light-toned material could represent an ancient airfall deposit that was later covered and altered by water. When the lakes dried out, the material broke up and wind erosion set in. Later in time, the Sirenum Fossae faults overprinted the landscape, crosscutting the knob field and the smooth surface on the left side of the image.

Very interesting is the high amount of wrinkle ridges in the region. Wrinkle ridges are common features on volcanic plains. They develop when the lava sheet is compressed and still slightly soft and elastic. The lava sheet buckles and deforms under the compressional stress triggered by the continuous pressure of the newly produced lava.