09/15 & 17 The Geology of Mount Shasta

Instructor: William Hirt
Date: Thursday Sept. 15, 7-9 PM (online)
Saturday Sept. 17, 8 AM-5 PM* (field day)
Location: Weed, CA
Tuition: $105 Full Class, $35 Online Only

*end time may vary slightly, please plan accordingly


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Mount Shasta is one of the largest of the High Cascade stratovolcanoes and has an eruptive history spanning 700,000 years. Two of the peak’s five major cones have grown since glaciers retreated from the mountain over 11,000 years ago, and the potential for future eruptive and debris flow events remains high. Although basement rocks are poorly exposed on and around the mountain, scattered outcrops suggest it stands atop serpentinite and associated rocks of the Eastern Klamath terrane. This course will introduce the tectonic setting, eruptive history, and potential hazards of Mount Shasta as well as briefly explore the ancient basement rocks that may underlie it and influence the chemistry of its lavas.

Field day is easy (~150 miles of driving with short hikes of less than 1 mile on graded trails).

Ages 12+ welcome.