Appalachian Mountains
During the early Triassic, the super-continent Pangea was formed as the Iapetus Ocean closed up and the proto-North American continent collided with Avalonia, part of modern-day Africa. This caused great uplift and the creation of the Appalachian Mountains, which, at the time, were bigger than modern-day Himalayas. Erosion of the Appalachian Mountains now exposes metamorphic rocks once very deep in the Earth’s mantle and uplifted during this time period.
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