LROC NAC before and after images of Marshall 17 March impact event. The newly formed crater is 18 meters (59 feet) in diameter [NASA/GSFC/Arizona State University].
This is not the first new impact crater the LROC team has found, nor will it be the last! Hundreds of changes to the surface appear in NAC temporal pairs, the LROC team is systematically searching this growing set of before/after images and results were presented at the American Geophysical Union Fall Meeting last week, and more is coming in the near future.
Revisit a previous LROC post showing new craters on the Moon formed by natural processes. Also note that new craters on the Moon were also formed by spacecraft impacts (Ranger, Apollo SIV-B, GRAIL), see a summary of LROC Featured Images on this topic.