Moon impact

At www.jpl.nasa.gov/news July 1st … from a lunar sample collected by Apollo 17 astronauts 40 years ago scientists have detected and dated carbon on the Moon – in the form of graphite. It dates back almost 4 billion years ago (estimate) and formed during a meteorite impact event. The carbon came either from the inpactor, and as it was found near the Mare Serenitatus there is a good chance the depression was formed at the same time, or alternatively, it condensed from carbon rich gas released during the impact event.