The appearance of the scene changes dramatically with the change in illumination. Although many of the blocks have the pitted appearance characteristic of the Viking 2 site, some are clearly different in morphology and, perhaps, chemical composition. Look, for example, at the smoothly polished block that appears a little to the right of center in figure 132. Its singular appearance is more subtly revealed in figures 130 and 131. In the first case, a smooth face reflects the evening light.
Orthogonal blocks occur throughout the scene.
Some wind faceting may have occurred, but most of the blockiness is probably the result of erosion of a volcanic lava that was traversed by several sets of mutually perpendicular joints. Note two boulders that occur close together a little to the left and above center in figure 133. They have matching faces which suggest that a single boulder has been split in two and the two parts separated, perhaps by frost heaving. Several of the large vesicular boulders in this scene display parallel stratification. A trench dug by the surface sampler is visible in the lower right.