Early Jurassic Tectonics and Paleogeography (180 Ma).

Early to Middle Jurassic (180 Ma)

·  Fringing Cordilleran arc accreted to western North America including Bridge River, North Cascades, western parts of Eastern Oregon terranes, and western terranes of Klamaths and Sierra Nevada

·  Older Mesozoic back arc basins closed

Early Jurassic Tectonic Map and Paleogeographic Map