Fine-grained thinly foliated greenschist and black phyllite occur in a north-northwest-trending belt along the west edge of the area. The rocks are particularly conspicuous near Bacon Peak and in the vicinity of Mount Shuksan.

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Lesath (stars.astro.illinois.edu) LESATH (Upsilon Scorpii). Lesath, Scorpius’s Upsilon star, is intimately related in the observer’s eye to Shaula (Lambda Scorpii), the two making the Scorpion’s famed, and very real-looking, stinger.

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Geology and Mineral Resources of the Northern part of the North Cascades National Park, Washington Reconnaissance geology of the 500-square-mile wilderness north of the Skagit River, and the mineral survey that was made before it became a park. 1972

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website

https://www.nps.gov/parkhistory/online_books/geology/publications/bul/1359/sec1a.htm