In this image, the purple, Star Peak basin is where the West Nevada Triassic basin sediments were deposited in the back arc environment. The green-gray rocks are the arc volcanics along the edge of NA. South of the Canadian border, the rocks are all forming in situ, but north of the border, island arcs continue to collide with western British Colombia through the Triassic and Jurassic. Localities that have a âtâ next to them have oceanic sediments of Tethyan origin, indicating Asiatic origin.
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