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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Windward Islands (Society Islands) (Wikipedia) The Windward Islands (French: Îles du Vent) are the eastern group of the Society Islands in French Polynesia, an overseas collectivity of France in the southern Pacific Ocean. These islands were also previously named the Georgian Islands in honour of King George III of the United Kingdom.

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