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moutains - The three Orogenies combined to form the...

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Major tectonic Events of the Phanerozoic in North America The opening of the Iapetus Ocean during the late Proterozoic and early Paleozoic separated paleozoic-North America from paleozoic-Europe & Africa. Different shallow water marine fossils indicate a deep Ocean basin separated the continents. The Taconic Orogeny in the late Ordovician (450 Ma) pushed a small island arc onto North America. This marked the beginning of the closing of the Iapetus Ocean The Caledonia Orogeny in the late Silurian/early Devonian (400 Ma) occurred when Europe collided with North America. The Hercynian (Alleghanian) Orogeny in the Pennsylvanian (300 Ma) occurred when Africa collided with North America. The Iapetus was closed by the End of the Paleozoic.
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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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