 Mount <unk> is part of the <unk> Range , an <unk> of the Laramide <unk> which separated from the Mosquito Range to the east around 28 million years ago . The tops of this range were heavily <unk> , leaving behind characteristic summit features and other such clues . For example , the base of <unk> on the eastern side exhibits large igneous and <unk> rocks deposited when the glaciers <unk> , which lie on a lateral <unk> . Further up the eastern side there is a large <unk> with a small <unk> . There are also lakes to both the north and south , <unk> and Twin Lakes respectively ; the Twin Lakes are a result of the natural dam of end moraines , and <unk> Lake was created by the <unk> Sugar <unk> Dam . 
