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Local Geology

Local Geology

College of the Siskiyous is located at the western base of Mount Shasta, a 14,162-foot high stratovolcano that has been built by eruptions during the past 200,000 years. The campus is also set close against the eastern flank of the Eddy Range, part of the Klamath Mountain system that stretches 150 km westward to the coast. Volcanism in the High Cascades and earthquakes beneath both the Klamaths and the Cascades are occurring in response to subduction of oceanic lithosphere beneath northern California. To learn more about regional volcanism and seismicity visit one or more of the following sites: