[pct-l] Sierra volcanic activity

[palomino.pct at gmail.com]

Mammoth Mountain is on the edge if the Long Valley Caldera. Google it for more info. In brief, this feature is not related to the Mendocino Triple Junction, it is not a subduction zone volcano, and the last major eruption was about 760,000 years ago. Just about any of the CA community colleges that serve the eastern Sierra offer field trips that teach you the whole story and are great fun.
Palomino
Jim Ostdick
San Juan Bautista, CA 
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