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2.6 Sierra Nevada and Coast Ranges, What is a Batholith?
During the Jurassic, when the North Atlantic began to open, a subduction zone formed along the western margin of the North American Plate. Evidence for this episode of subduction is found in a nearly continuous belt of igneous plutons that include Mexico's Baja batholith, the Sierra Nevada and Idaho batholith found in the Western United States, and the Coast Range batholith in Canada.
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