I remember that one of the reasons why the Taurus-Littrow region was chosen as the landing site for the Apollo 17 mission was because flashes from there were seen by the Apollo 15 astronauts. However, I never heard if the cause of those flashes was discovered.
Hence, the geologist was sent. :^) Schmidt found that every surface was pocked by micrometeor impacts, that impact was and is the dominant force at work in the formation of lunar surface features. The rest of the "lunar impact" keyword: