ABSTRACT
Most of the study areas are distributed around the equatorial belt of the Moon. The peaks lie at position angles 130°, corresponding to the author's system A, 130° to 160°, 90°, 40° to 50°, and 8°. The highest peak occurs at α = 130° and broadens to cover precisely the range of azimuth that is occupied by the most conspicuous lineaments that are associated with Mare Imbrium. Overall, the peaks of V show a remarkably strong correlation between the mapped trends of chains of small craters and the directions of the deduced fractures of the grid system. This finding strongly reinforces the contention that the majority of these craters in chains are endogenic. In the foregoing discussion of the distribution of craters in maria, people reasoned that lava flows, covering some areas of the surface and not others, were one possible cause of the contrasts in the number densities of craters across each study area.
