Apparently, the Torngat Mountains are home to a region known as the Saglek Block – the world’s oldest known stretch of a special type of rock. Known as metasedimentary, it is formed when layers of sediment solidify over the years. Eventually, high temperatures and pressures spark a recrystallization process in the rock.
Within the Saglek Block, the scientists discovered samples of graphite, a type of carbon. Although graphite can be formed in a number of ways, one of these is as a direct result of decaying organic matter. Previously, the oldest graphite known to have formed from living organisms was dated at between 3.7 and 3.8 billion years old.