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How were the San Gabriel Mountains Uplifted? Kim Gloersen One mountain said to the other across the rift "Hey, it's not my fault!" Plate Movements 30 Ma. , subductive tectonic movements occurred between the Farallon, North American, and Pacific plates. 20 Ma. the relative movements of the North American and the Pacific Plate changed from a head on head contact with the Farallon Plate to a lateral slipping against each other. The Big Bend The “big bend” of the San Andreas fault causes compression that pushes up the Transverse Ranges. Perspective of Big Bend compressional areas, with the addition of thrust faulting from the Sierra Madre. Thrust Faulting North-south cross section of the San Gabriel Mountains Compressional zones and thrust faulting. References • Atwater, Tanya. "Implications of Plate Tectonics for the Cenozoic Tectonic Evolution of Western North America." Geological Society of America Bulletin 81.12 (1970): 3513-536. Print. • "Geology of the San Gabriel Mountains, Transverse Ranges Province." Western Region Geology and Geophysics Science Center. Western Earth Surface Processes Team, 26 May 2006. Web. 15 June 2013.