Unlike Ganymede and Europa, Callisto shows little unequivocal evidence of endogenic surface activity, with the possible exception of 1 km-scale pits in some locales and a few landslides from crater walls.
Impact craters are the dominant landform.
Our new crater counts of these images reveal that the decrease in crater density also exists in these regions, which are far from the Valhalla and Asgard basins, further demonstrating that this is a global phenomenon. We find that the density in this region is higher at 10 km diameter and lower at 1 km diameter than the global average, i.e. the slope is shallower. We do not see evidence for the irregularly shaped 1 km-scale pits present in other regions, although small pits would be near the resolution limit. For the purpose of comparison, we will present measurements of craters from images taken in the 10th orbit with similar resolution, lighting, and compression.