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6.4 Notes California Geology The San Andreas Fault is a strike-slip fault located at a transform boundary Most of California is on the North American Plate. However, a part of the west coast of California is on the Pacific Plate. • • How were the Sierra Nevada Mountains created in California if we live on a transform boundary? California used to have a big subduction zone under it. The Farallon plate (an old oceanic crust) subducted under the North American Plate creating the Sierra Nevada Mountains. After the Farallon Plate mostly subducted, the Pacific Plate and the North American Plate then touched creating a transform boundary. The current Juan de Fuca plate is what is left of the Farallon plate. • • Are the Sierra Nevada Mountains still growing? Why or why not? No, that particular mountain range is no longer growing because now the Pacific plate and the North America plate meet at a transform boundary (not a convergent boundary). We now have a lot of earthquakes in California that we didn’t before because we are located at a transform boundary.