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Conclusion
The relative small amount of debris on the Moon is inconsistent with what we would expect if the solar system and Moon evolved over 4.6 × 109 years. It appears that two types of impacts have occurred:
a. a brief and recent interval of very high-velocity impacts by rocks launched from Earth, many of which were large, and
b. a diminishing number of smaller impacts, distributed today as shown in Regions A–C.
Several individuals have published attempts to answer the question of this technical note. Those efforts have usually (1) neglected the factor of 67, (2) ignored the large impacts shown by Point E, (3) assumed that the influx rate has always been what it is today, and (4) overlooked the relatively recent event that produced meteorites, pummeled the Moon, and provided secondary impactors.