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
Early Jurassic Tectonic Map and Paleogeographic Map