Permian Exotic Paleogeography, Southwestern US



Permian Exotic Paleogeography, Southwestern US (270 Ma). In this interpretation, the McCloud arc is a single arc separated from North America by a broad back arc basin, the Havallah basin. The Stikine arc is out of view to the west and interpreted as exotic to North America


Latest Permian Exotic Paleogeography, Southwestern US (250 Ma). The McCloud arc collapses against North America and the Sonoma orogeny forms. Tethyian oceanic plateau fragments are accreted along the Cache Creek forearc basin. The plateau fragments preceded the arrival of exotic Stikine arc, still out of view to the west



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