Geology and Mineral Resources of the Northern part of the North Cascades National Park, Washington

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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

path on GitHub

https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/usgs/publications/bulletin-1359/usgs.gov.md

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Rattlesnake Lake (Wikipedia) Rattlesnake Lake is a lake in the northwest United States, located in Rattlesnake Mountain Scenic Area in King County, Washington, approximately thirty miles (50 km) east of Seattle, south of Interstate 90.

snippet

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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website

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