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Unformatted text preview: The three Orogenies combined to form the Appalachian Mountain Belt. The Atlantic Ocean began to open in the Mesozoic pushing North America to the west where it began to collide with the Pacific plate moving east. The Nevadan Orogeny in the Jurassic (150 Ma) occurred as the Sierra Nevada Block collided with western North America. Numerous other suspect terranes have been attached to the western side of the North American continent. The Larimide Orogeny in the Tertiary (60 Ma)occurred as a spreading ridge in the Pacific began to collide with a subduction zone along the western edge of North America. The Nevadan and Larimide Orogenies combined to form the Cordilleran Mountain Belt....
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- Spring '08