The granite monolith of Squaretop Mountain (11,695 feet elevation) rises above Upper Green River Lake, in the Wind River Range, Bridger-Teton National Forest, Rocky Mountains, Wyoming, USA. We hiked a lollipop loop around Lower Green River Lake including the side trip to Upper Green River Lake (totalling 7.2 miles with 700 feet gain). The Continental Divide follows the crest of the "Winds". Mostly composed of granite batholiths formed deep within the earth over 1 billion years ago, the Wind River Range is one of the oldest mountain ranges in North America. These granite monoliths were uplifted, exposed by erosion, then carved by glaciers 500,000 years ago to form cirques and U-shaped valleys. Glaciers scoured the terminal moraine which naturally dams the Green River Lakes, the headwaters of the Green River (chief tributary to the Colorado River).
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