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Geology of Mount Shasta

Figure 12

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Figure 12: View looking northeastward across the lower end of the Hotlum Glacier. The glacier's terminal moraine is visible as the low ridges of grayish rock debris on either side of the small lake. The lake's pale blue color is due to fine glacial sediment ("glacial flour") suspended in the water. The lake lies at the head of Gravel Creek, whose incised channel can be seen in the middle distance. (Click on the picture for a larger image.)
 

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