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Find North Cascades geologic maps

Mount Baker
Sauk River
Skykomish River
Snoqualmie Pass
Robinson Mountain
Twisp
Chelan
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Geologic Map of the Sauk River 1:100,000 scale quadrangle, I-1661 published in 2002; digital version 2002

Reduced image of the geololgic map of the Sauk River quadrangle


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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This site last updated January 12, 2007