Sebec Lake was formed around 12,000 years ago when the last great ice glacier scraped its way north as it retreated. While carving out great gouges in the earth, the glacier simultaneously dropped massive boulders and rocks at random locations. Though it’s suspected that there were Native Americans living around Sebec Lake area as early as 11,000 years ago, there is little in concrete proof. Remnants and artifacts from more recent Native American residents have been found, dating between 500 and 3,000 years ago. The first European settlers arrived in the area in the early 1800s and proceeded to harvest the old-growth timber and mine for ore.