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Find North Cascades geologic maps Mount Baker Sauk River Skykomish River Snoqualmie Pass Robinson Mountain Twisp Chelan Wenatchee

Geologic Map of the Sauk River 1:100,000 scale quadrangle, I-1661 published in 2002; digital version 2002 Link to downloadable PDF files and database of the geologic map and correlation of map units (12.1 MB), cross sections (420 KB) and pamphlet with rock descriptions, illustrations and tables (1.2 MB).

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