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Geology of Mount Shasta

Figure 7

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Figure 7: Volcanic features produced by silica-poor lavas. The left photo shows Everitt Hill, a small shield volcano built by thin, overlapping flows of fluid lava that poured from the southern flank of Ancestral Mount Shasta 450,000 years ago. Lavas from Everitt Hill flowed 70 kilometers down the Sacramento River Canyon! The right photo shows a quarry wall that exposes the internal structure of a small tephra cone on the flank of Deer Mountain, just east of Mount Shasta. Note that the layers of bedded tephra dip gently towards the central vent, where part of the cone's feeder conduit is exposed.

 

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