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Geology of Mount Shasta

Figure 11

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Figure 11: Aerial view of Avalanche Gulch, a prominent glacial valley on Mount Shasta's southern side. The bowl-shaped depression at the head of the valley is a cirque, and the sharp ridges on either side are aretes. Sargents Ridge (labelled) is also an arete that lies north of the Old Ski Bowl. The rusty-red cliff at the head of Avalanche Gulch is the Red Banks, a pumice deposit that formed after the last major episode of glaciation on the mountain.
 

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