Which of the following processes resulted in the deformation of sedimentary units in the American West during the Jurassic Period?
-rifting of the North American plate
-glacial ice sheets pressing down on the North American plate, deforming it
-upwelling of mantle plume beneath the North American plate
-subduction of the Farallon plate beneath the North American plate
-extensive volcanic eruptions resulted from normal faulting of the North American plate