Geological Chronicle
Spur is a small impact crater on the north slope of Mons Hadley Delta, sitting about 200 meters above the plain to the north. It lies east of the much larger St. George crater and roughly 5 kilometers south of the Apollo 15 landing site.
During the mission's second extravehicular activity in 1971, astronauts David Scott and James Irwin drove to Spur — designated Geology Station 7 — to sample the crater's ejecta blanket and walls.
At Spur, Scott and Irwin recovered sample 15415, quickly called the "Genesis Rock": a large clast of anorthosite. Scott's reaction on finding it — "Guess what we just found! I think we found what we came for" — captured its significance. The same stop also yielded samples 15445 and 15455, black and white breccias thought to be impact melt breccia resulting from the Imbrium basin impact event.
The crater's informal name was given by the astronauts themselves during the mission. The International Astronomical Union formally adopted the name in 1973.