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Geology of Mount Shasta

Figure 8

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Figure 8: Volcanic features produced by silica-rich lavas. The left photo is an oblique aerial view of part of the Lava Park andesite flow on the northern slope of Mount Shasta. Because this lava is so "pasty", the flow formed thick lobes whose margins are about 100 meters high. The right photo shows a group domes that formed on the northern flank of Mount Shasta during the Misery Hill eruptive episode. Small masses of dacite lava rose to build the dome complex, which is about 1 kilometer long. Note that the flanks of the domes are now mantled by loose, blocky talus.


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