 Because the mountain is almost entirely covered in glaciers, no geological studies have been done, but published references state and the geological map shows that the mountain is an old eroded volcanic edifice.The mountain's main summit is , making it the second-highest thirteener (a peak between 13,000 and 13,999 feet in elevation) in Alaska.The second summit is located about to the east, reaching over , and another named summit, Parka Peak, is about further east across a glacier-covered saddle.