Find North Cascades geologic maps

Rock samples collected between 1957 and 1992 in the North Cascades available at North Cascades National Park, Marblemount

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Representative rock samples of major North Cascade gelogic units are archived with North Cascades National Park in Marblemount, Washington. Approximately 3200 samples (shown here as dots), most with thin sections, and classified by geologic map unit are available. For information about this collection contact the Curator at Marblemount. Telephone 360 873 4500