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Middle Jurassic Tectonics and Paleogeography (160 Ma).

Middle to Late Jurassic (160 Ma)
  • Major arc magmatism
  • Initial collision between southern Wrangellia and Cordilleran margin at approximately the latitude of Klamaths and Sierras
  • Fringing arcs south of collision zone
  • Ophiolites obducted in collision zone and in inter arc region between Cordilleran arc and fringing arcs
  • Foreland basin in Utah and thrusting in Nevada
  • Rift basin in southwestern North America related to opening Gulf of Mexico
  • Middle JurassicTectonic Map and Paleogeographic Map