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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
 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.
• 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.