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Geology of Mount Shasta

Figure 1

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Figure 1: Locations of the major High Cascade volcanoes and their lavas shown in relation to plate boundaries in the Pacific Northwest. Full arrows indicate spreading directions on divergent boundaries, and half arrows indicate directions of relative motion on shear boundaries. The outcrop pattern of High Cascade volcanic rocks is taken from McBirney and White (1982), and plate boundary locations are from Guffanti and Weaver (1988).

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