Mount Head is the third highest elevation in the Canadian province of New Brunswick. Mount Head is a monadnock, an erosinal reminant of resistant ingenous rocks that remained after an ancient Mesozoic peneplain surface was uplifted in the Cenozoic to form a plateau. Erosion from glaciers, water, wind has eroded the mountains for hundreds of millions of years. The mountain consists of 400 million-year-old rhyolitic and basaltic volcanics. The underlying rocks of Mount Head are part of the Gaspé Belt. This mountain is about 1 mile from Mount Carleton the New Brunswick Highlands highest peak.