North Cascades National Park, Washington. Sheared quartz diorite of the Chilliwack composite batholith forms the western buttress of Whatcom Peak to the northwest of Perfect Pass.
Dates
Date Taken
1967
Summary
North Cascades National Park, Washington. Sheared quartz diorite of the Chilliwack composite batholith forms the western buttress of Whatcom Peak to the northwest of Perfect Pass. Lighter-colored granodiorite underlies the mountain in the left foreground. Circa 1967. Figure 14, U.S. Geological Survey Bulletin 1359.
Summary
North Cascades National Park, Washington. Sheared quartz diorite of the Chilliwack composite batholith forms the western buttress of Whatcom Peak to the northwest of Perfect Pass. Lighter-colored granodiorite underlies the mountain in the left foreground. Circa 1967. Figure 14, U.S. Geological Survey Bulletin 1359.
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