Geological Chronicle
North Complex is a group of hills in the Hadley–Apennine region of the Moon, spanning 3.09 kilometers in diameter. Located roughly two kilometers east of Hadley Rille and three kilometers north of the Apollo 15 landing site, the hills are thought to be volcanic in origin.
The feature was an intended destination for the Apollo 15 astronauts, but problems extracting a rock core near the landing site left insufficient time to make the journey. Because no samples were collected there, their volcanic origin remains unconfirmed.
Geologist Gerald G. Schaber named the feature, which the astronauts called Schaber Hill. The crew named several small craters on the hills, including an 800-meter crater named Pluton, before the International Astronomical Union formally adopted the name North Complex in 1973.